Working on getting proof. May take a while to recreate.Pics or it didn't happen.
EDIT: Turns out the friend I was in the explore area with at the time had passed somewhat near (but not through) the structure you found Ossium in, and I guess it somehow teleported to my location? Point is, after nearly 30 resets going to the place I spotted it and then checking the other known spawn, I didn't find it by Castle Cormanthor even once, but found it by the known spawn 4 times. So, with that, I think we can say Ossium's spawn location has been identified.
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