Nature's Reprisal and Withering Touch Support inconsistency

Both Nature's Reprisal and Withering Touch Support have the same wording but while the former works with Cremation of Exhuming and can inflict withering stacks, the latter cannot. I assume it's due to the support gem having "attack" tag which Cremation isn't and lacks "spell" tag. It would be nice if either the wording was cleared up or Withering Touch Support could work with spells.

For the sake of clarity Nature's Reprisal states:

"

25% chance to inflict Withered for 2 seconds on Hit

Withering Touch Support states:

"

Supported Skills have 25% chance to inflict Withered on Hit