If you look, on the patreon there's a post about the problem with his internet connection.
The letter he got from his provider seems legit, I see no reason why he even would fake something like that.
Maybe the other ISP would work by now, but we won't know unless we hear from flamecito again.
I would be really sad to see this game be completely abandoned, when flamey continued to work on it, even after all the troubles he had (and I really don't think it has been as bad in the whole of Puerto Rico as it has been for him, obviously there will be parts were the reconstruction worked better and faster), but I would understand it, it clearly affected him a lot, as you could see in the game and to keep on working like that is probably harder than I can imagine.