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Don't know the code but he said it had cam sensor and some other sensor which suggested to him timing chain.
CYOA-
The alphabet soup of 3 letter codes on the factory stickers can be deciphered here.
https://vag-codes.info/vag-option-codes
The build sticker is often inside the door jambs and / or in the boot near the spare tyre.
It will tell you everything you need to know about your car from transmission through to paint colours.
Aroogah
Yes. Yes it could. It sounds as though the chain has slipped and ruined your valve timing, which would explain the drop in performance.
What engine code is it? There were lots of evolutions of the TSi engines. Some are more prone than others to issues.