At the moment, this coupon is a "free replacement" for "some of the options". For example, when successfully opening the door to the locker room, there are 3 options: "Apply coupon", "Make a promise", "Give pocket money" and all 3 options lead to the same scene. It is unlikely that the coupon will be needed for certain scenes.
I assume that the coupon will really only be needed to start the first seggs scene, and then all other "similar" scenes will open without the coupon. Although there may be other "start" options here too.
By the way, there was no information about testing version 0.8+ in the blog, although as a rule, such news was published regularly before previous updates (approximately 3-4 days before publication). There is a fear that the publication of the new version will be postponed again...