Weird/confusing name, questionable legality and the website went down a while back (while mentioned explicitly in the licence…)
Use CC0 1.0 or Zero Clause BSD instead. They are more reputable, and all decent “public domain equivalent” licences are… well, equivalent in effect, anyway.
The more important thing: anyone can see their posts now. This is rather crucial for a government institution’s feed and not true on Twitter anymore.