It does feel crazy, but there are a surprising number of remasters that are only 5-6 years newer than the original. Bioshock 2 was remastered around 6 years after it came out. Arkham City was remastered 5 years after it came out. Darksiders was remastered about 5 years after it first came out.
I’m assuming this Fortnite release is probably on an updated engine (compared to the original) and maybe has updated models or something? In that sense I guess it’s just another remaster that’s only about 6 years newer than the original.