In this case, the author didn't present any call to action. This is good. I hope nobody throws eggs at any houses, but I don't think this link promoted anything like that. More to the point, the request specifically how being on such a list affects processing requests from listed requesters. This would very much clarify & resolve the questions above.
I am curious what they use the list for. If it was used to set their future requests to a lower priority, I'm fine with that as long as the request gets fulfilled according to the requirements. If they just dust binned their future requests then I'd have issue with that. If they sent SWAT to their houses for no other reason than "excessive" FOIA requests then we'd have a real big problem. It kind of looks like it is for collecting fees... which is kind of boring.