Read it from the scan you've posted.
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He came out of the sand burial with a shredded body and it wasn't regenerating. Then Gaara cast the Sand Tsunami and he emerges out with his curse mark active.
Also Orochimaru even stated that it was due to his skeleton surviving the sand. He says "it can resist any type of physical attack" because of it
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but I suppose arguing the extent of his regenerative property is futile with insufficient evidence. Now that I think about it, it would explain where Kabuto obtained his regeneration from.
but that brings up another point. kabuto was inserting everyone's DNA including Kimmimaro. So everything Kimmi had, Kabuto has as well
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