I personally don't even like to begin until age 2. Parents just don't understand that daycare is so much different then home and don't understand I can't give their child all the attention that they can at home. My family that left a month ago (girl was 20 months) were also pushing the potty training. The girl was so not ready! It was just a fluke that sometimes she went when they put her on. I still wonder if that is one of the reasons that they left.
I personally wouldn't continue either. the parents can feel free to train at home but at daycare there are too many distractions and he is way too young IMO.