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Format will erase everything, including scene files, user files, and metadata files. Delete All will delete just the video clips.
... I noticed on Panasonics PASS Site https://eww.pass.panasonic.co.jp/p2ui/Login.do;jsessionid=FE44CBF8D5865F07974F6E8B6170D551
that there is a utility called AVCCAM Restorer. I have no idea what it is supposed to do or how well it works but it is on there and may be worth a look for your buddy...
Phil
you could just use "format" but... why? Delete All is infinitely safer, won't erase everything else on the card, and ... well, it just seems to me to be a good habit to get into.
Woah wait.. where exactly is this "delete all" option?