I don't know in this case specifically, but there are a LOT of tables in Orion that have description columns that I've never seen populated. I think in many cases they put them in there as a 'just in case' kind of thing and then never actually did anything with them. Snapshots may be one of those things where the VMware description is never recorded.
unfortunately it is not filled/polled correctly also in latest version.
We have opened ticket for this, but I cannot guarantee when this will be fixed/working as expected.