not really.  RFE could take an arbitrary measure to judge when to stop, it might not be cross-validation at all, thus it might well live happily with a single chunk.

Such a comment might be more relevant to SplitRFE defined later in this file.

Probably in both cases it would be worth to make such a hint more specific, e.g. "If you rely on cross-validation for the StoppingCriterion, make sure that ..."