Seen a January 2014 63 plate have this tensioner issue seems to have gone on longer this issue 😖
Depends what the route of the cause was determined. It could be a number of things. It could be as you say have failed as probability of any part failing is never zero.
It could be something else causing it to fail, oil feed, chain stretch, cambridge, sprocket ware, etc etc thenlist goes on.
Remember the mk7-8 still use a similar setup to the 6 just the ecu monitor the chain stretch and timing unlike the 6 and stop it destroying the engine.