Usually all that will show up on a carfax is that the car had a warranty repair. Honestly I'd rather have a new engine than them replacing parts piecemeal. Sounds like a spun bearing, my guess is they didn't clean things up very well when they did the sprocket repair work and a passage was clogged or something and resulted in a loss of oil pressure. Probably not something even related to the actual AVCS issue.
Although I would push for a new car as well if I was in your shoes.
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