I'm just going to play devil's advocate here and say that if the guy claimed Ayumi was in NY weeks ago, people would be skeptical as well since there was (apparently) no news up till now confirming that she had even left Japan. So the comment following the B&D PV release seems fine since the thread promoted discussion.

Also, in the past when Ayumi visited America, she only had one bodyguard. The 'bodyguards' the person referred to may just have been the crew. Crew for NY shoots are notoriously adamant about people leaving the production alone because there really is a sense of hurrying (and flash photography is prohibited). Could be true.