IIRC, the game pass option is basically a one-year subscription.
You know, my brain must be having one of those days where it just doesn't want to work, it was literally right there in the name of the product.
As far as I can remember, he said that Patreon is easier for him than SubscribeStar due to their payment system or something like that, while SubscribeStar is obviously easier for us.. which is why he came up with the solution of the yearly pass.
That's exactly why the pass exists, the Patreon is easier to work with, but he is kind of at odds with them due to what I will now be referring to as the 'huggy boy' incident both because of the name used to first describe the no sex version he specifically came up with in the face of Patreon not accepting the game as it was and because that just seems funny to me at the moment.
Basically, for anyone who was not around and hasn't been filled in, Patreon told him he can't have girls with certain body types or relations to other characters engaging in sexual acts with the MC or, if the relation is to another character, whatever character they are related to. He has been pretty blatant about his annoyance, if annoyance even covers the feeling, at having to rework vast areas of the game because of it.
He's also the type not to backseat drive his patrons, in other words to make the decision for them. He does want us to choose what we are most comfortable with, which for now is likely Patreon because they have the payment options that are more secure and easier to use, but those same options are why the 'huggy boy' incident happened in the first place.