Well, specifically it's because everyone went home and switched from purchasing services to goods. So there are serious composition effects comparing 2019 to 2020 and you don't have to assume you're making less money because an inflation number said you are.
Monthly inflation numbers have been > 5% since May 2021. Oil didn't exceed 2018 $s until will into October 2021.
(I should be clear, this is still supply-side, but related to Covid relief. "Stimulus" money spent unproductively by the government is also supply-side.)
You also had PPP loans which went to businesses that saw growth! And those business owners got huge payouts used to buy houses and assets
So buildings increase in value due to supply disruption too.
Homes are a special case, but it's entirely possible for the purchase price of homes to go up while rent doesn't.
This is not true and has wrongly given credit to people who have said, since 2020, that COVID relief would cause inflation.
Our current inflation is driven by supply chain issues (unrelated to COVID relief) and rising oil (unrelated to COVID relief.)