What did Enver Hoxha contribute to Marxism-Leninism? And why are they dogmatic?

I've seen the YouTube channel S4A posting audiobooks of Enver Hoxha lately and a lot of people here and on Reddit considered him a doctrinist or something. I'm asking what makes him so polarising in Marxist circles and what ideas he introduced for Marxism-Leninism.

Sorry if my question is a bit broad and such. I'm just starting to get annoyed.