Yes, me having an opinion that's different than yours makes me dumb. Great logic there.
WWE is professional wrestling. Yes, the outcomes are predetermined, and it's one of the lowest forms of entertainment on earth, but they are engaging in a type of wrestling and being paid professionally to do so. Could Gable make an argument that he shouldn't lose eligibility because WWE is different than NCAA wrestling? Yes, he could. But allowing him to compete in NCAA wrestling sets a precedent that could allow somebody to argue that freestyle is different than NCAA wrestling as well. A baseball player could argue that professional baseball uses wood bats and is therefore different than college, which still uses metal bats.
We are at the point where the entire idea of amateurism in athletics is pretty much gone anyway, and this is just another example of that.