I'm leaning more towards the need to buy it again being unintentional mainly since it wasn't mentioned in the update blog. I remember the windows version wasn't uploaded for a few day around version 0.2.2. Another factor in if it's an oversight is the fact the creator doesn't need to buy the game from itch.io. If anybody here got it though the Patreon link, can you confirm if you had to pay again?
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I created a feature request on their Github. Maybe if enough people pile onto it it will get addressed. https://github.com/itchio/itch.io/issues/1775