I wouldn't say so. It doesn't imply that these users are superior, just that the software is targeted at that audience. This is no different than software targeted at children, novice users, or any other group of users.
But then again, they do mention they want to avoid "stupid questions" from novice users on the dwm page, so there is an air of superiority there I don't support.
"stupid questions" doesn't sound too bad until you actually experience the deterioration of communities. For suckless I don't think it's a threat, as their specialization already filters the 99 percent. But try to find, for example, a community for experts in Java. I personally think it is a fine language, but it was designed to appeal to beginner/intermediate programmers, and any community around it suffers from that. You wouldn't believe how many people just open Github issues (with nothing but a title - the default issue template left untouched) for any NullPointerException, regardless if it is related or not.
StackOverflow is an interesting case also, they get a lot of criticism for being "toxic", but it is getting difficult to get answers to actually interesting questions. "How do i read a CPU register in C?" gets answered with "why would you want to access the CPU registers ??? It is an low level implementation detail therefore you cannot read them".
