Yes, my son was dianosed with Apraxia when he was 2 1/2. Apraxia is a motor planning problem and therapy should also include Occupational therapy. It sounds as if ECI is not providing enough services.
Apraxia is a difficult Speech issue to fix. It takes a Speech Therapist trained specifically in Apraxia. If you google, Kaufman Speech Center, it may give you additional resources. There is also a Apraxia website. I can't remember what it is called but it too will give you additional support.
It will probably take years to fix his issue. My son is now 7 and he still qualifies for speech therapy. He is now speaking in full sentences; some words are difficult to understand especially since his vocabulary is advanced and people don't think a child can use such words.
Good luck and stay strong. He will need you to never back down from advocated for him. Apraxia has nothing to do with his intelligence. My son is above grade level in reading and math. But, it is a condition that is hard to fix and receive enough therapy. Please look through my older answers; I have given additional ideas in previous posts.