I assume that was a custom offer. On your gig page for that it says “unlimited revisions” on each package. Though if he took less than the 20 revisions before the order is complete, Fiverr will still expect the seller to allow any unused revisions after it’s complete to be used.
So I still think having a more reasonable number of revisions in gigs & offers would be better. ie. take out “unlimited” from the gig packages and put about 5 or 9 if you really want to allow that. And in offers it’s probably best not to offer 20 revisions if you don’t want to revise 20 times. Put a much lower max (I didn’t think 20 could be offered.).