this is absolutely false. In their last video, the devs's ASOBO said that the replay is in progress and would be releasethis year. In fact it already exists because they are using it for development, but it's for the moment an external program to MSFS. they just need to integrate it into the simulator and add an interface.
Replay mode is one of the first request by the communauty (see the dev notes), so it's evident they will do it quickly.
Personnally, since this last (and recent) video of Asobo, and the eternal delayed of FCR, i decided to wait the replay mode of MSFS and in fonction of his quality i will buy FCR or not. I would have bought fcr if Asobo hadn't made this recent announcement. But I refuse to pay expensively for a program that we will soon be able to have in native MSFS.