fossilesqueLiterally no help at all
trxxruraxvrArmadillos are mammals, so probably more like convergent evolution and not an ancestor
Glyptodon are mammels too, and a direct ancestor of armadillos! The -don in the name does imply dinosaur, so I can see why one would make the assumptuon.
They are not direct ancestors of extant armadillo species, but they are themselves armadillos.