Because it’s early on and it’s a guide on new things to try, not a bible you have to follow religiously. If you agree nothing’s allowed all month, go with that, but for many a ruined orgasm is hardly any relief at all.
The POINT of Locktober is to have some sexy fun together and discover new things, using chastity play and tease & denial to make that happen. The rules are whatever you want them to be, mine are just suggestions.