The only silly thing here is that "low income housing" got rebranded as "affordable housing" and absolutely everything else got rebranded as "luxury homes" for political reasons.
"Market-rate housing" is even sillier given that it is literally the opposite of what "affordable housing" policies dictate
What >you< are referring to and what it is conflated with by progressive policymakers is "low income housing" which imposes an AMI based restriction on the resident's income. This in turn means that 30% of their income is much lower and restricts the sticker price of the home.
In recent years, most 'affordable housing' policy has been advanced by progressives, who use that term for marketing purposes, whereas the actual policy primarily relates to 'low income housing' or even 'very low income housing.' This does not mean 'affordable housing' = 'low income housing', it just means the term 'affordable housing' is used in the title and the actual measures advanced are related to AMI and 'low income housing.'
When you are dealing with income levels it is universally called 'low income housing,' and the HUD definition is already scaled to local income levels, the 'A' in AMI stands for 'Area.'
You are conflating marketing ('we need more affordable housing!') with policy ('low income housing')