Why do Kpop stans on YouTube not understand the "How Would Group sing group" videos?

On those very popular line distribution videos on YouTube for example:

"How Would BLACKPINK sing O.O. by NMIXX" you would see a commenter saying "it's fake" that it's not Blackpink's voice even though the YouTuber who posted the video never claimed it was. It's a reimagining of how they think Blackpink would sing O.O. if it was by them and not NMIXX

Quote from Bpsosoro

Maybe English isn’t their first/fluent language

Or they are kids

i know but it just gets annoying seeing editors yelled at because it's not Blackpink's voice when they never stated it was.