Not that I wouldn't put it past Vino. But this seems a little precious from Aru IMHO. Mechanics screw things up sometimes. Froome's bike keeps having issues, yet he never says anything publicly about it, much less about the mechanics making one fiftieth of what he's making. Uran at times lets the wrenches pick his gears and pressures and won a stage with two freaking gears for the last 20km. The time he ended up losing the Tour by he likely lost because his main TT bike was mms shy of UCI compliance, yet not a peep from him. It was leaked ouy later by his own DS.
If he rolled the dice and is riding without having inked his UAE deal, I get why he would feel like the weight of the world is on his shoulders. But if you get this worked up about equipment then do a Contador and insist on your own mechanic. Otherwise accept that while you're being given a free role you might not be the team's top priority at the moment. And that people make mistakes sometimes.