Was it when he changed the shutter speeds before cocking the shutter, he actually put it on the wrong speed? If I recall correctly the shutter speed dial rotates when the shutter is fired and finishes up at a different place on the dial, so when you wind on the film it brings the dial into the correct position to change the shutter speed against the engraved marks?

It is unlikely that any damage has been caused but this would give the incorrect reading he (the 'repairer') found when he tested the shutter. I have had a number of cameras made in Russia or the Ukraine and couple of early Leica's where I have forgetfully changed the shutter speed before winding on. There has never been a problem afterwards so I think you may have been worrying unnecessarily.

It may be possible that the actual dial is out of sync too. On the ones I had there is or was a tiny screw that held the shutter speed dial in the right place and this had slackened off and slipped. It was just a matter of unscrewing it a little more and re-positioning the dial to the right place and firmly tightening the screw