It’s a bit of a conundrum. As has been pointed out, he’s not a jersey holder so there’s no official unofficial rule to say that they should wait but clearly if they don’t it will be perceived as unsporting.
I’ll bet Astana are praying that one of the French teams (Roland would be a likely candidate on past form…) decides it’ll live with the consequences against the benefit of a win on Bastille Day and go on the attack, ‘forcing’ Astana to chase…
In fact, given Vino at the helm, a man who I don’t believe understands that the word ‘ethics’ even exists, I’d say he’s probably on the phone to the French teams offering to pay them to attack…