Is Aleksey90 a different person from Dark Silver?
Yes, DS is making his own follow up called Glamour.
BBAS has the same premisse as the original Big Brother, but I find it by far better in design (and it's really not the same, if you want the same, the BB Renpy Remake is what you are looking for).
I don't know if Aleksey hired someone for coding, but the last update shows definitly some technical progress.
The hints are still a mess sometimes, but the progress with Alice had effects on her general 'behaviour'. The moment she becomes aware of what she's doing with Max (meaning: without using candy), several other encounters are extended as well, play differently. That's something us players keep demanding in every BB incarnation and every relationship based game.
It's not perfect, some things still don't line up and sadly so far it's also limited to lewd scenes. But Aleksey in my opinion goes into the right direction, even if that means, that there is less story progress per update.
What I still miss somehow is the general interaction between the two. Now that they crossed a certain line (let's just say: rewards for a 'foot' massage), they should be a bit more open, some random fooling around or joking or something like that when she's at her desk in the evening. I know Max at least on the surface is obsessed with sex and only sex (see shopping trip intro), but he also claims to care for them and Alice could show a more friendly side, it's time to learn a bit more about her persona, that has nothing to do with webcam shows or leather outfits.