Will we still get updates here, even though its sold on Steam?
Yes, the Steam version is like anything else, Ren'Py games are not protected on Steam in any way, they are just like they are on Patreon, the game is on Patreon too, but it's $15 now in both places. If you read previous comments, if you played the version here now, then you've already played the new update, as the update only adds new lore (reading material) and VN mode.
It boils down to someone leaking/sharing said update, the dev won't do public releases now the game is being sold on Steam.