Could be. But it wasn't. Because if it was, that would be a very simple matter that everyone understands and is understandable, and therefore easy to convey to the guests.

"I'm sorry, we can't accept gifts for vtubers, only fleshtubers, out of concern for airtags and tracking devices. She appreciates the thought, please post a picture of it on her discord." would resolve ANY issues related to "dangerous gifts".

Instead, they chuck it in an open nearby trash and say "It's a BOMB!" (in Chibi's case, notably NOT calling a bomb squad afterwards, just taking glee in the destruction of property), or they confirm that it WILL go to the vtuber (a verbal contract made, and Henya specifically wanted the gifts to go to her, airtag risk be damned) and then threw out everything (in Henya's case, or claimed to throw out, at least).

Which isn't exactly conducive to, you know, security or the public.

When the truth is less destructive, less invasive, and less damaging than a lie, why would they lie? The obvious answer is that that "truth" isn't the truth. They were not protecting vtubers, and denying the presents stops the Twitchcon staff and execs from stealing the gifts and claiming they were "thrown out".