Aphasia

ETA: I read your added 'so what happened.'
My Dad, recovered a bit. But he died. After his stroke and due to many other health problems. His death was not due to, the stroke, itself.
He could talk, but not well.
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Are you asking in regard to a child... or adult?

ETA: I read your "so what happened":
1) My late Dad, had a stroke. Yes, it affects eating and speech. My Dad was seeing a physical and speech therapist. For it.

2) My son, when he was a Toddler, had Speech Therapy, for a speech delay. BUT... before beginning speech therapy, they gave him an overall developmental assessment, to rule out, if his speech delay was perhaps due to Aphasia or Dysphagia, etc.
He did not have either of those.

With any stroke, at least per my Dad... he had to have therapy for speech and eating. Because, it affects eating too. And can cause, choking.
Your Dad, can be or should be... referred to a Therapist... who will work with him on eating/swallowing/speech etc.
Because, it can be a safety hazard. With a stroke, one cannot swallow... properly nor eat/chew properly etc. Hence it can become a choking hazard.

Speak to your Dad's, Doctor. Or get him referred to a Therapist etc. for stroke victims.
This is normal protocol, for stroke victims.

Depending on the severity of the stroke, a person may not even be able to... eat or chew or swallow. HENCE, a nutritionist, ALSO needs to be seen... and they will give you, a diet and food list of what he can or cannot eat. Per the stroke and inability to eat or swallow etc.
My Dad... could not "drink" nor anything liquid. His liquids had to be... thickened. With something they told us to buy. And which they initially gave to us.
So, even the texture of foods or drinks... is very important.
For example.
My Dad, was even taught "how" to swallow... liquids. Because he'd choke on regular liquids that normal people could drink.
All his liquids, had to be thickened.

The entire dynamics, of a person's inability to do things, after a stroke, gets impacted. Not only their brain. Their body, too. It is the nervous system and the loss of muscle functions, too.
Through physical therapy, it can be... improved. Or not. Depending on the severity of the stroke.
Your Dad, REALLY needs to see or get referred to a Therapist if he has not already been.

My Dad, had his speech impacted too. And one side of his body.
He then had to have a walker, to help him walk etc.
And his speech was not normal, after the stroke.
All of this, gets impacted by a stroke. Fine motor skills and gross motor skills.
To various degrees.

I had a bad side affect happen to me when I was on a statin for high cholesterol.
My memory was very bad and my joints ached.
I once drove down a road I'd traveled on every day for 10 years and for 10 min I had no idea where I was.
I couldn't remember words or spelling and I'd be writing SO MANY reminder notes for everything and then forgetting where I put the notes.
It (and the joint pain) totally went away when I stopped taking the cholesterol medication.
Sometimes memory problems are medication related.

Almost all of my husband's patients have episodes of Aphasia. He's a Peds Neurologist, and specializes in epilepsy and seizure problems.

Sounds like your Dad is having episodes of Aphasia post-stroke, post-procedure? Was your dad a heavy smoker or drinker or diabetic? His recovery will unfortunately be slow and limited at best. Sometimes these patients can sing to their favorite songs or swear up a storm, but not express themselves anymore. So sorry M. for this change in your Dad at such a young age.

It happened to my MIL after a major stroke. She could not walk. Had speech therapy for a year. The first year is where they might see results. After that,
not so much. If she was relaxed, she would sometimes just speak some words. She did understand everything. I would just keep up the therapies because he is young. It is very frustrating. Wish I could offer more help. We just used to wing it. Some days were better than others. She was in a nursing home for 13 years since she could not ambulate at all. Hugs.