Hi Jane. The name on the profile just above the birthdate line shows as
Richard Robert [uncertain] Taft
This is intended to indicate that the middle name Robert is uncertain, not that the existence of the person is uncertain. It results from the status "uncertain" on the middle name in the data fields for the profile.
It could have been set this way if there are no reliable primary sources stating that the middle name was Robert. (Middle names were unusual at this time.)