I would agree, Morgan. The activities described assume the child has the ability to communicate what he is seeing. We don’t require the child to do something that he cannot do, and it seems like you have a great handle on what your son can and cannot do at this point. Your efforts to model speech and to provide ways and opportunities for him to communicate his thoughts are what is most important right now.
Continue to feed his mind even if he cannot tell you what he thinks about everything.
If you are concerned that you might be putting words into his mouth, or jumping to the wrong conclusion when you “repeat” what he says, perhaps you could offer your sentence as an additional observation rather than a restating of what he supposedly thinks. For example, if he says “oooh,” you could say something like, “That sounds like an owl. I like to hear owls say hoooo.” Or when you ask what color the butterfly is and he mutters, you might say, “That butterfly is yellow. I think yellow is a pretty color.” Just a thought. Not to say that what you are doing is wrong; just another idea because you sound uneasy about what you are doing.
Bottom line, use CM ideas that fit where your child is in his developmental level and skills. With his good receptive skills, you can read good books to him, show him good art, listen to good music, read poetry, work on habits, play outside and inside, and more. And you’re doing a great job trying to help him develop his expressive skills. 🙂