Overall, I really liked the video--I agree with almost everything. In regards to being open with emotion and whether or not facial expressions seems genuine, I don't think this is Fe/Fi related. I don't see a pattern in the people I know with this.
For instance, my best friend through middle and high school was an ISFJ, and she was a master at pretending to have whatever emotion she wanted to. But she was also pretty expressive. I know another ISFJ pretty well, and he was pretty mysterious with his emotions. I think he had an issue with being a man and a Feeler, honestly, because he liked to emphasize how analytical he was and how he liked to deal with "cold, hard facts," but it was obvious he had high Fe. With the ESFJs I've known, some are masters of portraying whatever emotion they want to and some are transparent and can't hide. With INFJs, I can't hide my true emotions for the life of me, but the other suspected INFJs I've known are pretty damn mysterious with their emotions.
With Fi-users, my ISFP mother is much better than I am at faking warmth for strangers while my ESFP sister can't hide her true emotions and always comes off fake when trying to be "falsely happy." For the ENFPs I know, I would have said before that they wear their emotions on their sleeves, but what people have said about this being their energy instead of emotions is making me rethink this.
So overall, I think that whether someone is open with their emotions, or is able to fake emotions convincingly, is related to far more factors than Fe/Fi.