The context you are missing is that the person who had discovered this vulnerability has mad it up to be basically on the line of a easily doable RCE in every server you have (and every desktop Linux). Something which if you work in a position related to system administration can easily mean a bunch of unplanned overtime. Which is very very different to the IRL situation of "oh we are most most likely not affected but to be sure just disable printer discovery temporary".
The post isn't meant to be dismissive of there being a vulnerability, it's dismissive of it being "so bad you can pawn all Linux systems ever", especially in context of servers. And if I had to guess it partially exist so that if people (as in people doing sysadmin stuff) consult here she can point them to the blog post instead of repeating herself over and over.
Through in general I agree that there are parts of the Linux community which do not handle security concerns well at all.
But also there is a trend of people which do not understand what they are talking about and refuse to learn or people which just want a ton of attention blowing up security issues out of proportion again and again. And that is bad kinda like the story of the child who yelling wolf except it's like 50 adults yelling wolf. It also can lead to all kind of other personal annoyances like you having to unnecessarily doing overtime and wasting time with having people to tell again and again "yes we are fine, this doesn't affect us, actually this doesn't affect most server setups. Yes they said otherwise, yes they knowingly misrepresented facts when they announced that there will be a vulnerability beforehand, no they never had a good reputation but we have to take them serious anyway, etc. etc.". So I have quite a bit of understanding for some people in the field being sometimes quite annoyed (not for all of them tho).
(Also to I think you might be reading a bit too much into here blog post and my comments above where meant to be "in general" not specific to the blog post.)