VOLSTATS on tapes

In looking at the info here

http://www-01.ibm.com/support/knowledgecenter/ssw_i5_71/cl/prterrlog.htm
(this is a beta site)

regarding the PRTERRLOG command, the help on the VOLSTAT parm says (among
other things):

"Note: ENDOPT(*UNLOAD) must be specified during the SAVE operation to
generate volume statistics at the completion of the tape operation."

If this is this saying what I think it's saying, then:
If your SAVxxx command is ENDOPT(*REWIND) because you're going to
programmatically check that the object(s) made it to tape, or
ENDOPT(*LEAVE) because you've got more to add to the tape
then the volume stats are not updated? What if you're doing a Save 21 or
equivalent? Then you always have multiple SAVxxx commands following each
other.
Or does it mean simply that the stats are not updated until you ultimately
*UNLOAD the tape? What if you didn't unload by SW, but pressed the eject
button on the tape drive?