You are correct, the reports are to give you an information about both date of the VMs restore point, when they were backed up and date when the file was written to the tape.
Thanks for the request about number of tapes used during the period.
I`ve got a question about it. You write backups on tapes with some protection period. After a while some tapes become available to rewrite. So the "tape capacity planning" essence is to show how much tapes were used and made protected, how many became available and how many clean tapes there are, to predict when you need to buy new ones. Does it sound correct?