The bad engine is probably a contributor to what caused the failed catalytic converter. In the process of dying the first engine dropped a lot of stuff into the exhaust system. Those engines with direct injection had a terrible reputation for self-destructing and using a lot of oil. See if the repair shop says anything about a check engine light if one was on. That light should come on when you turn on the ignition then go out shortly after that (self testing mode). Let us know what they tell you.
Oh, the check engine light was on, alright. I saw that myself.