I think the OP was saying that it is not a good thing to encourage people inputting their personal passwords to untrusted websites.

I dunno, the comment clearly says you shouldn't be putting wifi network passwords into websites, not passwords in general.

They weren't commenting on the need to put passwords on wifi networks.

The thesis of the reply was "it makes sense to have a WiFi password even if it isn't secret". That's directly about whether it's okay to put a wifi password into a website.