Hello!
Whenever a major release of Transportal comes out for Patrons, the previous release's in-game content becomes freely downloadable on itch.io.
Currently, the newest (Patreon-only) release is 0.3.4.
When the next major release comes out for Patrons, itch.io will get the content in 0.3.4 for free.
So yes, the current Patreon version's in-game content will eventually be on itch.io.
Patrons just get access to the content earlier. :)
Thanks for playing!