The merit they evaluate for is loyalty to the leader, not academic merit, or some other measure.

Yes, but this isn't what they'll say if you ask them.

Hiring based on the worst prejudice or nepotism is still merit based in this sense. Meritocracy is supposed to be about varieties of merit which you aren't ashamed to admit are relevant.

And zeal for carrying out the elected official’s agenda. Which is the whole point of political appointments.