If by old videos you mean the old downloaded ones prior to the app then the answer is no, and yes and it depends. If you mean the old vids on the old Suf app, then yes, but the app is set to be turned off mid November.
If you have pre app vids, then No, because the vids won’t link to anything nor connect to anything.
If you have pre app vids, then Yes, in that you could record your efforts using level mode and running any of the open vids, minimized. That would give you a record in the app but would be weird when synced to Strava or anywhere else cuz then you’d be showing as having done an Open Vid but your power profile and everything else will be from the old vid you played.