Earlier quoted context omitted.
I actually don't get what's the problem here. I manage a team and one time I booked a vacation and then we hired a guy. He quit (he was the only person to ever quit that was working under me, company is treating employees good) and said in the review that this was horrible from my side. Am I not suppose to take a vacation ever?
You can take vacations whenever you want, but you can't hire new staff and just let them twist in the wind concurrently with you taking time off. Holidays are planned ahead. Don't hire at the same time. Easy.
This is not realistic and quite frankly bad suggestion.
"Yeah, we would hire you next week, but since manager is on vacation we can hire you only in three weeks." Said no-one ever.
And what's the problem in taking those first two weeks to just slowly get to know the code and get to know your workmates? If I had a situation like that I would be thankful that I don't get shoved into work immediately and can take my time.