Omega updates and upgrades movements all the time when they see problems develop over the life of the movement. Updates are still made decades after the fact if needed, so yes they still update as required when the watch is sent in for service.
This is not covered under warranty unless the watch has an actual failure. I have upgraded a lot of these movements with the new parts when they come to me for servicing, but of all that I have serviced, only one watch has had an actual failure of one of the parts that were not upgraded. A lot of the negativity you see on this movement is propagated by one single person on the forums who seems to have made it his life's work to scare people away from buying watches with this movement family in them.
Cheers, Al
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