Right, for starters, Arc is on a break, he takes 1 week breaks every 2 to 3 months.
If things go according to plan, he should be back this weekend.
He forgot to upload to itch.io because he uses a different method to upload the game (itch.io's butler, which allows people to update the game without having to redownload the entire game each time while also allowing him to only upload the changes).
I'm guessing he couldn't set it up properly in his laptop before leaving.
On Patreon/Subscribestar he just used the same links for the supporter release (since there were no patches).
Not really something he could do here since there are no early access versions on itch.io, only the public version.