A search here would turn up the answer, but succinctly, NO, this hasn't been a problem on Caymans. Supposedly there have been a few Caymans that had the problem, but it always seems to be someone's cousin's friends uncles sisters brothers co-worker that had the problem. I don't think any of our members here have ever reported an actual case. So not saying it can't happen, but pretty darn rare.
The Advice from LN Engineering might be good advice to help your engine regardless, but chances are you aren't going to have an IMS failure on a Cayman.