Sorry, I thought it was semantics. I thought that you meant that it’s called not-kosher, not treif.
I’m still not sure what you are saying. I used the word “treif” to mean “non-kosher”. It is not technically correct to use the word ”treif” in place of non-kosher. That ‘s what I thought you meant. That would be semantics.
It sounds like you are saying something else. Are you saying that it wouldn’t even be correct to refer to milk after meat as “unkosher”? I’m not sure why that should be.
Why are you allowed to feed the kid milk after meat? Is that because it’s only a gezeira and not the real issur of basar b’chalav or for another reason?