This is the Motte and Bailey technique.

Attacking "Political Correctness" in a vague and non-specific way lets you sound noble.

As soon as you specify what that means in practice you just sound like a nasty bully (at best), so best leave that implied.

But a quick glance as the history of social science that these things are a direct response to, would reveal people "proving" that various groups are inferior in ways that mirror contemporary prejudices and reinforce right-wing politics that consistently builds hierarchical models to justify current social inequalities.