How not to write a press release

Wisin and Yandel Concert apparently set an attendance record at a concert. I say apparently because that is the claim on the Hispanic PR Wire press release.

However, they don't mention how many people were in attendance. They also don't say whose record they broke, or in other words, according to who is that record broken (i.e. Guinness Book of World Records?)?

Tell me if I'm missing something. But certainly, you should not make claims in a press release and then not provide any details on the claim or worse not have any attribution to that claim. Otherwise, we're left to think that maybe it's just the most people their promoter has ever seen. Credibility is important.