It's not my project - I just stumbled upon the repository and figured I'd post a link here - but from what I have seen so far it seems to be a faithful re-implementation so far, so no online MP. I checked the open enhancement requests, and found none. Maybe open one to ask whether they're considering it?
These modifications are possible because the game has been decompiled back to modifiable source code. At this point they can add anything to the game with enough dedication.
Looking at their GitHub page, I'm gonna say no. You need the ROM file of the original game, so while it looks like they're doing some things like key bindings and increased frame rates, I'd be shocked if they went so far as to implement something as complex as online multiplayer.