That article is incorrect. The quote that it uses comes from a MadInfinite article, which sources a French article. The quote regarding F-Tech appears nowhere in the original French interview. I believe it was a copy pasta by MadInfinite that never got caught but everyone ran with it.
The MSFS engine is entirely homegrown for MSFS, derived in part from previous Asobo projects. There is not a line of ForzaTech or Unreal in it.
-Matt | Working Title