Leaking radiator, then water pump

My radiator was replaced a couple weeks ago. Now I’m losing coolant again and the mechanic says it’s the water pump. The only thing is that I saw coolant drips at the front of the car too. I thought it came from the front and then spread to the back as I drove. The mechanic is saying the opposite, that it leaks from the back and gets spun up to the front where I saw drips on the undertray.

Is this reasonable? Probably need to top up coolant every 120 miles or so.

Is it just bad luck that the water pump could fail so soon after the radiator replacement? The shop that did the radiator said they pressure tested the system, which I thought is normal but maybe that blew something out?

07 9-3, 2.0T. 248,000 miles or so