The plot of the remake diverges in several ways that contradicts events in the original two games.
Viewing post in Final Fantasy Blackmoon Prophecy Remake comments
I wasn’t happy with a lot of elements in the original game, and as I set about trying to make it more cohesive and just better overall, it led to changes in the story that just wouldn’t work with the original. When I realized this, I just decided to lean into further changes to make the remake interesting for returning players.