Spring slipped...did mechanic cause?
 

Had 2004 xc70 in the shop to have timing belt replaced on Thursday. I had them check out the suspension at the same time and have scheduled this week to replace control arms. Today it started making a bad sound from drivers side. It looks like the spring is out of the lower seat. Is this likely a coincidence? Picture attached. Would also appreciate any input on what this will take to repair?

Highly unlikely. Unless they put a compressor on it which there was no need to, they did not cause that