Are you saying that pastafarian is not equal to another religion? You're absolutely heinous. I'm reporting you for discrimination.
I'm also joking. But to treat one above another on the basis of religion is literally the definition of discrimination. The exact same discrimination the original article was about.
The extremely obvious major difference here is that the company isn't based in a country with a dark past history of institutional prejudice against Pastafarians, let alone one which eventually led to genocide.
Edit to add: you also have a major false equivalence in your initial premise re: "required to check all religious holidays from all people that could reasonably attend".
SUSECon is a public conference attended by customers/users/community, but specifically in this case they chose a date incompatible with the religious beliefs of an extremely high-profile SUSE employee, whose job responsibilities would require them to be highly visibly working at the conference. This is absolutely not the same thing as failing to schedule the conference dates in a way that is sensitive to all possible attendees.
This situation also should be considered in the context of all the other things discussed in the article (prior to the section on SUSECon), not in isolation.
I'm also joking. But to treat one above another on the basis of religion is literally the definition of discrimination. The exact same discrimination the original article was about.