I would need to talk to the parents and find out what they are doing at home first of all? Are they at all interested in changing this...supporting a change???
I too do home childcare...and recently started making my own baby food....I have more control over texture and freshness this way....some baby foods are fine (variety and flavor) but if I had to eat it..I prefer the fresh stuff (I make batches in my small food chopper and freeze it in ice cube trays for convenient size servings...pop them into a baggie after frozen solid and lable with date and contents...and lately..texture...lumpy or fine, etc....easy, cheap and tastes better!)......
Is this child gagging on it, or simply won't eat the more textured stuff? Sounds like perhaps they need to be weaned into it more? They are all different, and some are all on table food at 9 or 10 mos and feeding themselves...tohers are much later...I have one of these "later" kids right now due to ruling out allergies....
Either way, this child really needs to be making progress towards table foods....and the parents help and support can be key.....