Yep, that seems to be a 3V flash, meaning if there's no voltage translation (most/all of the chinese carts lack that), the carts will eventually commit sudoku.
That's the downside in the current GB homebrew ecosystem, nobody is making quality repro boards for big stuff, only chinese sources available, with their typical issues. BennVenn keeps talking about making such, but his stuff is always sold out, and the timing for when stuff will appear is very varying. INL has also talked about designing such, but no timelines.
edit: The NES, SNES and Genesis state is much better, if GB is not the goal by itself.