Before Elon, posts on Twitter were sorted and hidden at the whim of engagement-maximizing algorithm. After Elon, the same is the case, maybe with the same tweak to the algorithm.
I thought the idea that timeline sorting order on social media sites is deterministic or scrutable to the viewer is long dead by now - it's not been the case for at least a good decade now!
While that's true, the thing where ~all bluetick replies are promoted above ~all normal replies is a post-Musk 'innovation'. Stupid idea; there's 25 years of experience showing that pay-for-attention is corrosive to social sites (dating/hookup sites have been trying to make it work basically forever, and have generally ended up having to ration it).