You forgetting that they announced it as well on Discord, and placed it on youtube to see the trailer. So its not locked. The link to the trailer is on the Announcement channel.
When the Christmas special part 2 arrived it was in version 1.8, while the patreon got a updated content of the special and some skins for the arcade mode in the 1.9
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Check on Discord, the trailer was both announced for Patreon AND Discord members who have access to the "#Announcements !" channel.
Its locked on Patreon because of spoiler of it, but it got released later for the public on Discord via the announcement. Thats what im getting at about it.
( I should had phrased it better in the other comment )