Even if you delete all rem’s, they still show up in searches. They are descendants of “Unamed Rem”. What really happens when we use “Delete all Rem” on the user panel?
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The eloquent silence answers: Rem’s are deleted but they are not, at the same time …
Sorry, I can’t provide any definitive answer. I can only guess:
Rem’s are deleted but they are not, at the same time …
I think when you delete the REMs, they are in a floating state between deleted and existance. Their are neither fully there nor fully gone. However, as soon as you search for the REMs, you force the REMs to collapse into one state of certainty and thus it can appear as if they are still there. 
Also after deleting REMs you can always check:
Here you’ll find deleted REMs that are stored for one week until they vanish forever. So I assume, after this week the REMs will also dissappear from the search. But again, I haven’t tried to search for old REMs after one week.