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> More than 500 naturally occurring amino acids are known [..exist], although only 22 appear in the genetic code.

So, the article doesn't list which amino acids were found, except one, glutamic acid. The real question is, which amino acids were found.

Is there the possibility that these amino acids appeared on the asteroid after it landed on earth/during entry through the athmosphere?

Hayabusa2 rendezvoused with the asteroid in space ("asteroid", not "meteorite"). The asteroid never entered Earth atmosphere.