"A version of this design has been referenced by drawings, other designs, or manufacturing-related files and cannot be deleted."

[eerier_bleach0f]

No it's not. This is still a bug?

[programming2C78B]

confirmed from this menu?

[eerier_bleach0f]

Oh oops wrong forum section.

Yes:

[jeff_strater]

This warning will appear if any past versions of any designs reference the design you are trying to delete.  Those will NOT show up in the uses/used in dialog, which only show current versions.