The free version of .7/.75 can still be found - yes.
The premium version, however, cannot. Check your own page - there's four items. Two games split between a free and a premium version.
I am aware that the version I purchased is still in my library. I'm saying you should have five games - this one should have premium .75 and a premium .8. The fact that it's no longer possible to purchase .75 (and I do get the reasoning there - who in their right mind would purchase a deprecated product?) means that you have zero problem with pulling the rug out from the people who tried to support you.
You basically instituted a behavior that this platform doesn't support because you want more money - not out of fairness. Patreon <> Itch. There are other developers who understand this and treat them both differently. I would say I don't understand why you're trying to force the subscription behavior onto this platform, but again, you just want more money.