What are you on about? The only things exclusive so far are the deluxe box, variant Vigo, throwback minis pack, and the dice tower. A good chunk of the previous exclusives appear to be available non-exclusively through the deluxe resin pack, albeit at a hefty premium.

The Extreme Ghostbusters are only available through Proton Slinger tier so far, but seeing as they aren't tagged as exclusive, I see no reason why one should assume they won't be released as a retail expansion later on. Makes no sense to announce such an expansion when only half of them are reached through stretch goals 3 days into the campaign.