You missed my point. It’s not that the three species would naturally combine genetically, but that random changes to the genome could naturally result in the exact genetic makeup that we created in the laboratory. It is mathematically possible, if however phenomenally unlikely. But the point was that you can’t say it would never occur in nature. It can,... maybe,... if you wait long enough...
I did miss your point! If they are adding artic eel genes to pacific salmon, how could that ever happen in nature?