Yeah, he should definitely hang for that.
He's only just turned 21 and not au fait with Spanish employment law. Perhaps he's done a few shifts in offices out Darlo way where there might be aircon, or has friends or relatives that do.
To start throwing hyperbole like 'tone deaf' at him will just make him say: stuff the mixed zone or worse, start talking in rehearsed clichés. I'd sooner have him say what he thought and develop into a character.
To be frank, it often surprises me that cyclists know anything at all that isn't directly related to what they need to eat next, what components they have on their bike (inc. crank lengths, saddle specs etc), a load of W/Kg style training data and a bit of tax law. Maybe some local knowledge of coffee stops.
Aside from that, I assume the 27C law is an energy grid issue, and while it's pretty hot, if you're in an office and just sitting around it's not dangerous, and you can have a fan on top of that. In the June heatwave here my flat was often over 30C.
Meanwhile, Brennan's cycle computer was showing 41C at the foot of the climb and 44C further into the stage. These are temperatures where it can be genuinely dangerous just to be out and about, let alone racing a bike. I don't think Visma need to intervene while he's out by 7C re employment law, given he's still expected to ride a bike at nearly 20C higher than that