"Wtf does 'high horology' mean?"

What people usually mean by "high horology" or "haute horology" is non mass produced luxury timepieces that usually have low annual production numbers, have incredible level of hand finished movement detail and intracacies, from start to finish the watches are all hand assembled, usually have 1 watch maker per 1 watch produced (watchmaker works on the watch from start to finish), the movements are typically a feat of hand assembled engineering, and the brand also typically has a very rich and storied history. As a result of all these impeccable traits, these timepieces are typically well over $50k USD and get into the millions. That is a general sum of what people usually mean when they say "high horology" or "haute horology".

P.S. Don't shoot the messenger. Just relaying what people usually mean when they use those terms. Whether they are right or wrong is a different story.