Yea that doesn't make sense to me to be honest. I continue to question the mods convenient justifications and exceptions to video spam. My opinion is that the thread in question should be locked for no discussion or purpose in combination with video spam, period.
Supposedly it's because it's community related? I dunno, I've been around here a while and don't even know the guy who posted it.
It wouldn't surprise me if that is the 'unwritten rule' that they conveniently exercise for certain individuals, though I personally disagree with it if it goes against the rules established and enforced upon everyone else.