If it’s purely political, is it still heresy?
Depends on what political kingdom you belong too..
heresy, sedition, espionage, agitprop.. are all related..
Marxists and democrats preach too..
I don't recall ever reading any accont of John Adams telling Thomas Paine "We don't want or need your kind, here. Shut up and get out.", so if it's following a political tradition, it's not ours.