Just googled TMO intervention.Didn't see the game but just looking at the result that is a good outcome for France. A whole lot of young players have taken a big step forward. Given where French rugby was just a few years ago it is good to see (or hear about in my case).
Looking at those two clips of knock ons, you can see the referee in both clips, no way he could give either of them. I agree with salarchaser that the TMO can't intervene for either, if there had been foul play it would be different. Don't know what the nearside assistant referee can see. So I am not sure what everyone is expecting, knock ons and forward passes get missed all the time. Rule number one is, don't guess. Interesting that none of the whingers appear to be French.
So, it depends on how many phases there were between the 'knock on' and the try.
Can the TMO intervene on any matter they like?
No, the TMO in rugby is basically restricted to two crucial areas:
1. The scoring of a try, whether the grounding of the ball or the build-up to the try. Any infringement within the two phases prior to a try would render it illegal.