“my question is why they are being considered Kosher when
It says in the Torah that mixing unlike creatures is one of the primary abominations that brought on the flood of Noah?”
If that is your only question, it is an easy one to answer. While it is assur for a Jew to graft species it isnt for a non-Jew and the result is Kosher. Thus even IF GMO’s where Kilaim (which they likely aren’t) it till doesnt make the product assur
“this is an abomination in the eyes of the Lord.”
Try not to decide what He finds an abomination. LEt HIm tell us. He gave us the Torah and eating Kilayim done by others is allowed as abominable as you may find it.