Again, progressives oppose development regardless of affordability. They, for example, opposed amending the city charter to exempt affordable housing projects from discretionary review. They are suing UCSF over hospital expansion and opposed it constructing new housing for its staff. They organized against state bill SB35 and various density bonuses that allow for the construction of new affordable housing. They opposed the height and density proposed for a 100% affordable housing project through HANC and dragged proposals for redevelopment at Potrero Yard and CCSF through decades of process. Progressive political consultants worked for Livermore NIMBYs to spin a lawsuit against a proposed downtown affordable housing project. I could go on.
20 years ago, progs would admit outright that they thought new development was undesirable. Since, it has become more inappropriate to say that out loud so they dress it in concerns about only supporting housing under economically infeasible conditions.