The majority of his watchers are supportive of the sizes he currently draws his women at. Just my opinion of course, but I think what makes his art stand out above other artists who also draw, for lack of a better word, "booty pics", and why I feel he doesn't need to change anything is:
1: He's a good painter who understands value, volume, tone and doubles as a landscape artist. That painting style benefits these pictures also, because the backgrounds add ambiance and he is able to use light and shadow in interesting ways that can visually imply more thickness or volume in the flesh without having to alter the form or structure.
2: He has achieved, in my opinion, the perfect juxtaposition of thicc but fit, and I think that's what makes it work for him and why people are attracted to the art in the first place. This is a very specific type of art that visually achieves a different aesthetic because he uses the proportions that he does.
Pushing the weight any more would alter the work and place into a different category I feel (like the ones you are mentioning). If he wants to do that he can of course, but I see thicc and BBW as two different things that achieve different looks and emphasize different things about the body that make them attractive. If you look closely at the entire anatomy of many of his girls, they have a thin/fit body, thin to medium waistline, supported by strong back muscles and abdomen, which then support everything from the waist down which is bottom heavy (this is where the "thicc" is at). People who view his work understand, then, that this is his definition of "Thicc", and I would agree with it based on my own preferences within this type of art. If he makes the women larger overall (where the fat is kinda evenly dispersed everywhere like in some of your links), then he would simply be drawing obese women looking sexy, which would take this into a different type of fetish art. Since we know he's capable of drawing realistic anatomy and structure (his Cammy and Amazon pictures are good examples) it's safe to assume that how he draws the thicc women has come through trial, error, practice and, perhaps, a combination of what he himself is comfortable with. I don't feel it's on us to suggest he change this or cater to anything else, especially if the majority of people aren't sounding off....unless they are doing so privately, but this conversation assumes transparency.
Anyhow, you asked for people's opinions, and that's mine. Thank you for your courtesy in asking the question.