How did the stimulus checks boost economy so much?

I'm hearing from all the YouTube gurus that the economy rallied in 2020 from the stimulus checks, billion sf of commercial real estate to be built to accommodate all of the spending. Car market exploding with 100% mark ups on new cars. Housing prices skyrocketing. etc

Like the checks were $1200.. and they weren't even given to everyone. Most people spent it on food and booze in like a week. They didn't go out and finance a new monster truck or put a down payment on a $500k house with them.

I'm 99% sure they're actually referring to trillions of dollars of quantative easement that caused all of this, instead of blaming the stimulus checks lol