maybe it just looked like he was talking to a wall and bluetooth/ear-phones aren't as common of a thing (tho small food trucks aside i can imagine some restaurants with a lot of space would have it to talk to the other chefs/line cooks if not like a 'radio' or so depending on how famous/busy a place is), but we probably needed a dialogue to just emphasize the 'weirdness' happening lol , but i guess it's good they can't see it bc cosplay aside, they might freak out if eventually one of them did cross over (tho i imagine they can at least get inside his truck to help(?)/hang out , based on the volume covers' art)
Dude he's tapping into potential money maker! Altho let's think about it, even if it's extremely insignificant, he's basically draining the money out of that world with no return to balance it out? Or will he start buying off world ingredients?