wow - I think you're taking this waaaay too seriously.
Power steering fluid is held in a container, attached to the mechanism. THAT is what he replaced in March.
It is very likely that when the mechanism went out, it caused an overpressure of the hose, causing a weak spot. A weak spot that you found about 2 months later.
That's why it's not covered under the warranty - the MECHANISM didn't break - another part did.
He can't control when he gets the hose - so you can relax about that. He's probably HOPING it comes soon, but it's out of his control.
On the rental car - he is BENDING OVER BACKWARDS to help you. You aren't entitled to a rental - the hose broke, not the part he fixed. But he's being nice in even offering to pay for one. Of course it needs to be your credit card - HE ain't payin' if you wreck it.
The worst thing I've heard is that he isn't a good communicator. Sorry, but that goes both ways. If you were in my office complaining like it sounds from your post - I'd tell you anything to get you to leave too.
He's a mechanic - not a car psychic, and not a customer service expert. I'd cut him some slack.