Average nationwide for Private is 70-80 hrs so he’s not far off.
It includes the very old, ten very young and the ones that start/stop/start/stop.
This requires some investigation on the side of the new CFI.
Take the endorsement advisory circular and go through the logbook with a tooth comb. It’s not unusual for a CFI to make mistakes on endorsements or finding endorsements that have expired.
Again, if this student comes from another school it may be worth paying them a visit.
I would never let a student fly solo on another CFI’s endorsements.
If a student gets transferred to me it’s now my student, my responsibility and it will be on my endorsements.
My limitations too by the way.