Hi again LrColiver!
The 2D archive refers to the Patreon-exclusive content archive. I release additional Minifantasy content on Patreon every month, and it goes into this archive (which already contains hundreds of additional add-ons and creatures).
Main asset packs are not Patreon-exclusive content. As a Patreon subscriber, you get claiming links for new main Itch releases, but subscribing doesn't grant access to all previously released main asset packs on Itch.
To access all previously released main asset packs, you can get the complete bundle or buy them individually if you only want a few of them.
As a Patron, you also get 50% discount coupons for individual asset packs (send me a direct message on Patreon and I'll send you the 50% off link for the asset packs you want. Note that the discount can NOT be applied to the already discounted complete bundle. For getting the entire collection available in Itch, the cheapest option is the complete bundle).
Lastly, if the Patreon tier description was confusing and you ended up subscribed to a tier that doesn't provide what you wanted, send me a direct message on Patreon and I'll refund your subscription.
If you need any other thing, just let me know :)