I've seen players occasionally have wild fluctuations from season to season for no explainable reason.
Philip Lowry was one of my guys many seasons ago who just stopped hitting for power from S6 to S8/9 despite only minor decline in his power rating (which was offset by improvement in contact, batting eye and vsL split). IIRC, there were no major engine changes during that period that would explain the sudden drop in power output for him.
So what you're pointing out is nothing new. But now there is an explanation.
I don't see a need to "re-rate" hitters.