Found my own answer.
Page 133-- Deleting snapshots is not listed as one of the actions available for automation.
That's really disappointing!
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you could have vrops send an email to vro when the event triggers and vro could run a workflow to delete the snapshots. There are some blogs that explain it better than i could.
So I found the blog you mentioned here: https://www.virtualiseme.net.au/index.php/learning-vro-part-5-and-vrops-trigger-flows-from-vrops-using-smtp/
However in my investigation, I also discovered that VMare released a vROps 6.6/6.7 compatible management pack for vRO that seems to be capable of mapping alerts to vRO workflows so I think I'm gonna give that a shot first.