Genocide means the murder of a genos, a people, and does not necessarily involve murdering persons. The most common tactics of genocide, for example, involves outlawing language, because language is a cornerstone of a people.
I agree with the general tenor of the arguments that that's stupid, language isn't that big a deal, and calling outlawing a language "genocide" absolutely trivializes it to the point of — hold on, actually, let me take a sec, you do
know that the Ukraine banned the official use of and education in the Russian language in a series of laws starting years ago, right? Are you sure this is how you want to define this?
BUT regardless, that doesn't actually matter because
context matters. In
context, you said, paraphrasing, that there would be plenty of room in the conquered regions to resettle Roman citizens because of genocide. That clearly implies a functional genocide of removing the actual people, which didn't happen. Now you're retreating into this alternate definition which
no longer supports your claim. On top of that, your new definition
still doesn't apply in context because we know that the Romans didn't outlaw the languages or customs of conquered people, but allowed them to integrate on their own on the theory (apparently correct) that Roman splendor would convince them that Roman ways were better.
So you don't actually have a point here.