I think Unbox Therapy made that video early in 2019 about a 2018 MBA, well before the 2019 latest generation butterfly keyboard was released.
The 2019 Keyboard has been out for about 4 months +-, and it seems to be holding up much better. Certainly nowhere near the issues of the earlier generation keyboards. Some tech sites are starting to acknowledge this improvement. For example, per an article in iMore today:
"Apple did fix the butterfly keyboard. Without the numbers in front of me (because there is no such thing), I haven't heard a single complaint about the third-generation butterfly keyboard's reliability and that's a stark difference from the previous two generations."
That said, we don't have hard data, and I would be stunned if there have been zero failures of the 2019 Butterfly keyboard. I would also be surprised if there were zero failures with the new 16in MBP keyboard after 4 months. All mass produced keyboard designs are going to have some failures. The only question is wether the failure rate is acceptable.
BTW - I have a 2019 MBA, and it has been flawless.