It’s very hard to tell from videos, and I’m not in the beta so I can’t try it myself, but from what I have seen, it does seem different and maybe better?
The last video seems to be more outside textures still popping, but not so much the cockpit?
My big complaint is/was cockpit textures popping. Is that better or is it just an artifact of the screen captures?
It might depend on the aircraft. In some only the textures are affected, while in others (particularly those by Carenado) you can see the entire instruments pop into place.
For me, there is zero improvement either with the SU6 beta.
As ChaoticSplendid said, I think it varies a lot from plane to plane. Fenix A320, it seems to luckily just be a few minor details (the registration and some shadows) that load slowly, while other planes its also the PFD, ND etc…