Basically, the guy says:
1) TouchID isn't any more secure than a PIN code for a casual thief/hacker, it's simply more convenient to enter.
Not quite he said, but the point is yes, it's a huge advantage because it's much, much more convenient, and that's a good thing. There is no claim that it is more secure. Furthermore, I don't think anyone here with any common sense is arguing that it is more secure. Certainly, I am not arguing it is more secure. I am arguing it is hugely convenient... and like I said before I've been wanting something like this for nearly a decade, but didn't expect to see it (working well) before 2020.
Motorola came out with this back in 2011 I believe, but it was totally useless because of crappy implementation. It took until 2013 for Apple's take two, to make it usable.
2) TouchID is actually less secure from a 5th Amendment standpoint.
Dunno, but I don't live in the US.
3) TouchID would only add security if it was a second layer on top of an existing security layer, thus bypassing any convenience.
Yes, this is what he says, for stuff where increased security is desirable, like banking transactions. However, he does not advocate combo passcode + fingerprint for just unlocking your lock screen on your phone. That would simply be stupid, unless you work for the CIA or something.
BTW, I don't understand why stuff like face unlock and pattern unlock are given a free pass. Well, maybe I can understand for face unlock, because it's badly enough implemented that people don't use it anyway, so it becomes moot. Face unlock is the epitome of useless gimmick. However, pattern unlock is also inferior to a long passcode, yet nobody here seems up in arms about its inferior security.