Good news,
I was able to test Flight Control Replay in the closed beta and to create a video about it. It is actually really great! Watching MSFS2020 in replay and slow motion is sooo much more beautiful. This will enable video creators for so many great things!
It also does much more then just recodings and replay (e.g. AI aircrafts for shots of formation flights, works in VR, automated camera changes, etc.).
Check out this video: https://www.youtube.com/watch?v=Fpb-IntaIHk&feature=youtu.be
Cheers