However, on the Ulyanovsk, that compartment was also there and it had a more square design.
Sure, but even considering that, to begin with there is still little to no evidence or logic to suggest that the Chinese Navy are interested in putting a VLS on the bow, and substantial logic to suggest that they would actually probably prefer it was not there.
If anything, I think the open compartment we are seeing is simply an open compartment that has yet to be "closed". Previous larger open compartments were visible on 001A's hull a few months ago as well, before being closed up on top as well.
This, eventually became....
This, where the open compartments were eventually sealed up. I expect the forward bow open compartment will eventually be sealed as well once the relevant subsystems have been assembled there to be ready for integration
edit: If one was interested in using the VLS configuration of another ship like Kuznetsov or Ulyanovsk to suggest that 001A's "open compartment" could be a VLS, then we would need two things first:
1: evidence or logic first to suggest that 001A's "open compartment" is not merely something else (such as an open compartment that has yet to be sealed)
2: either evidence or logic to provide a solid argument for why the Chinese Navy may desire a forward bow VLS to begin with
If 1 and 2 cannot be fulfilled, then the fact that the open compartment on 001A's bow may superficially resemble the VLS arrangement of Ulyanovsk (aka a square) provides no evidence at all to suggest that the open compartment on the bow could be a VLS.