he simply announced the Release dates on Itch ... besides he clearly stated 

[0.7] - Changelog & Release Dates

and on the release dates it says "Tier" which makes it obvious (i think) that it isnt Itch because i dont think Itch has any form of Monthly Payment for there to be "Tiers" ... if u pay for the game here then you will only get the 0.6 version as stated... if u want to buy the 0.7 on Itch then u will need to wait till April 16 for the Public Release