They aren't. Your parent post already mentioned that they were extracted by filming.
Passwords don't have the other 2 problems, and I'm not really sure what is gained by not talking about them.
1) did not write what are needed parameters of the photo or quality of left fingerprint
2) it does not look like they used photo from an angle of the screen as in article but some other closeup
3) somehow unlock stuff with thumb where most people use index finger
4) then they use index finger to operate "thumb" print
5) who touches screen like that with thumb, who touches back of the phone like that
In the end with PIN I can look over someones shoulder and not even have to make a video.
I agree with the premise of what they say that people might think fingerprint is "super secure" while it is not...
But it is secure enough for most of the people and more secure that typing in PIN or short password or for people using 0000 or 1234 as PIN.
Someone can use their smartphone to film other person as they type stuff in, no need for printing fake print. They can steal phone/laptop as soon as they are done filming.
This is the case that fingerprint sensors are preventing.
Pointing out problems is useless - as people don't have alternative that would be "all-mighty secure without flaws".
It should be defense in depth not - and that is already there for example banking apps - you need fingerprint to unlock the phone and banking app requires its own specific PIN. Getting those 2 things makes it much harder for bad guys to do something like money transfer. Yeah they might get your photos and other stuff - but probably there are secure store apps that would encrypt your photos if you have ones that you really want to protect.