If you want to characterize Welch specifically as a "nostalgic boomer" I'm not going to argue. (He might even be pre-boomer?)
Calling these proposals "ethnic cleansing" is ridiculous hyperbole. Not as stupid as a death-threat song lyric tweet, but definitely unhelpful. Welch was rightly called out for that one.
Here is Calvin Welch, friends with Marti and Cohen and housing guru to Sup. Preston, saying Home S.F., a gentler streamlining measure vs. SB35, was ethnic cleansing: https://missionlocal.org/2016/01/sf-delays-controversial-hou....
I’ll keep looking for the other statement I had in mind.