We can put that one to bed. Carburetor heat induced rich cuts are an OPT (Old Pilot's Tale). Doesn't happen.
Unfortunately it isn't and it does. Complacency though, "doesn't happen" should be guarded against, it leads to too many avoidable and tragic accidents: "there old pilots and bold pilots but there are no old bold pilots springs to mind". The Lycoming 0-235 engine installed in the C152 is very prone to running very rich being just one example. Rich cuts as with carburetor icing leaves little or no trace and therefore makes it very difficult to establish the cause after the event.