Biden is doing this because he'd rather use this disaster to push "affordable (multi-family) housing".
So, my understanding is that: it's a buyer's market, skyrocketting home prices.
1) "because of lack of new houses."
Why not just build out?
2) "Because lumber prices."
"Why Is There a Lumber Shortage in the U.S.?" (Newsweek/MSNBC...same thing) https://www.msn.com/en-us/news/us/why-is-there-a-lumber-shortage-in-the-us/ar-BB18cmMJ https://archive.is/j3vpM
"Solving the Lumber Crisis" (National Association of Homebuilders) https://www.nahb.org/Advocacy/top-priorities/material-costs/solving-the-lumber-crisis https://archive.is/l8Pra
3) So why doesn't Biden (and, to be fair, why didn't Trump) 'do something' about lumber prices? Such as lowering the tariffs on Canadian lumber?
"U.S. Homebuilders Urge Biden to Help Ease Sky-High Lumber Costs" (Boomberg) https://www.bloomberg.com/news/articles/2021-02-12/u-s-home-builders-urge-biden-to-help-slow-housing-inflation https://archive.is/6oC0D
"Congress pushes Biden to intervene on rising lumber prices" (Mar 2021) https://www.woodworkingnetwork.com/news/woodworking-industry-news/congress-pushes-biden-intervene-rising-lumber-prices https://archive.is/cr9gz
4) I can't speak for Trump's motivations(greed, most likely) but maybe Biden is doing this because he'd rather use this disaster to push "affordable (multi-family) housing".
"BLM will never come to the suburbs!"
They'll be living next door to you soon.