Ah, didn't notice that.
Does this author not set their release posts to automatically expand access by tier?
In his apology for the delayed 0.4 release, he wrote something about having set up automatic release-posts but claimed the site could have bugged out on him...
If you look at the earlier version-releases you will see the intended release-cycle.
v0.3 for example was first released for the $20 tier on November 3rd. 7 days later for the $10 tier (there was no $15 tier yet), three days after that for the $5 tier, and another 4 days after that for the $3 tier. So the "2 weeks ahead" means "2 weeks earlier than the
lowest tier", not "2 weeks before the next tier".
It's now been 13 days since the $20-Release of v0.45. So it should have been available for the $15 tier 9 or 10 days ago (3 or 4 days after the $20 tier).
I wrote him a message on patreon, but he doesn't respond.