Final Fantasy VII Remake was first announced at E3 2015 and its trailer stated the fans could "play it first on PlayStation 4", which many took to mean that the game would be a timed exclusive and would be coming to other systems in the future. The latest trailer for the game that was revealed at E3 2019 only had a worldwide release date and the PlayStation 4 logo in its credits, with no mention of the game appearing on other systems.
A video was recently posted to the Xbox Germany Facebook page that seemingly confirmed that Final Fantasy VII Remake would be coming to the Xbox One on the same day as the PlayStation 4. The video was quickly removed and it was established that it was an error and that no announcements concerning an Xbox One release of Final Fantasy VII Remake were pending. Square Enix has since issued a statement to the Video Games Chronicle, confirming that Final Fantasy VII Remake would only be released for PlayStation 4 and that there were no plans for it to be released on other systems.
It might seem unlikely that Square Enix would keep their biggest upcoming title on a single system, but the big publishers are preparing for an exclusives war in the upcoming console generation, which has resulted in Microsoft buying up numerous studios and Sony preparing to do the same. The PlayStation 4 has had some incredible exclusives across its lifespan, including titles like Bloodborne and God of War, and keeping the Final Fantasy VII Remake on the PlayStation 4 would be a huge draw for the system.
The statement that Square Enix has no plans to release Final Fantasy VII Remake on other systems doesn't mean that it won't happen in the future. Square Enix has been a huge supporter of the PC platform and Steam in recent years, with many of their classic titles being reissued specifically for home computers. The fact that Final Fantasy VII Remake has been split into several games that will take years to develop means that they will overlap with the PlayStation 5 and Xbox Scarlett, so it seems likely that Final Fantasy VII Remake series will consist of cross-generational titles.
Source: Video Games Chronicle