No, they weren’t here on student visas and only 3 had expired visas. Now the case can absolutely be made that they should have never been granted visas, but no President can overhaul an immigration system in 8 months.
OK, to put it more precisely, the bulk of them were here on fraudulent visas or expired visas. 3 or more depending on the source were expired visas, while most of the rest were improperly or fraudulently filled out.