No. There's no way you'd be riding an hour at FTP 2 days after a 350tss road race. As I said, I did 1h at 300w, which wasn't particularity difficult, but not a cake walk either. My ftp is around 350.
So to do 340, you'd be looking around 370 real ftp.
Surely puts his FTP at 340w?
Edit: that was his sweetspot effort. Yikes.