Does below 2000 rating players do not know how to checkmate the king with many queens?

The umbrella bishop. Legend.

A useful pattern to remember. ;-)

Best thing is: Black calls himself the CheckmaterMaster.

that's super aesthetic

also, for @Checkmatemaster1994 lichess.org/appeal

I wonder how OP came across this game in the first place

Maybe Black was insulted at having to play this out and engineered the stalemate. Certainly, if checkmate was the objective it was easy enough many moves earlier without all those promotions.

Not good

yeah I think so?
dunno

No...they just toying u