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No. The “fact” that species cannot interbreed with one another is NOT any sort of reason why a 2% genetic difference would not accumulate between two separate populations of (what once was) the same species.

It would, in fact, ENFORCE that there was no genetic merging of the lines, if there were genetic problems with interbreeding.

So you are completely wrong about that and have, once again, no mechanism to explain what would stop a 2% genetic difference from accumulating, and apparently neither are you intelligent enough to understand that your proposed mechanism would in fact increase the likelihood of what I propose rather than making it impossible.

Would you like to try again?

What is going to stop a 2% genetic difference from accumulating over time in two separate populations of what once was the same species?