I don't know how this theory fits in with patient H.M. who was still capable of many types of learning and planning, despite having his entire hippocampus remov

I don't know how this theory fits in with patient H.M. who was still capable of many types of learning and planning, despite having his entire hippocampus removed. https://en.wikipedia.org/wiki/Henry_Molaison https://en.wikipedia.org/wiki/Henry_Molaison At the least such a broad sweeping theory of how a brain region works should address how it fits in with evidence with the most famous lesion (and deeply studied) patient who did not have said brain area?