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The original post says he drove 7000km after the IMS bearing was replaced. Then all peachy until one day it doesn't start.
That doesn't point to someone setting the timing incorrectly that far back.
IMS sprocket shifting on the shaft would still only affect the left cylinder head (the sprocket going to the right head is machined as a single piece with the primary IMS chain sprocket or at least it is with my "bicycle chain" type, so that failure wouldn't affect both heads.
What is more puzzling is that OP stated the mechanic checked the timing and it appears good now.
OP,
Did he test compression, or do you know about the valve contact because he bore scoped it?
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