Harmful for the same reason as the 'healthy at any size' campaign, and anti progressive because if they claim health at every size, then they deny there's a huge malnutrition problem in America. It would be solving the problem of food deserts and obesity by just saying 'no no these people are actually healthy' instead of making sure they don't live in a fucking food desert.
I thought you had a fun shitpost when only this was what I could read:
"What do you think of this post? I think it's harmful and anti progressive in places." to /c/main by MaoTheLawn
Cause it would be a fun self ironic play with self critique. Sadly it wasn't such a shitpost.
That woulda been funny tbf