This was likely true.
Trump didn’t need to know about it, and (since by all accounts, he’s functionally illiterate) he certainly never read it. Project 2025 is the brainchild of the same groups who chose Amy Coney Barrett and Brett Cavanaugh. Trump likely knew very little about them, too.
Trump was chosen because he’s easy to manipulate and is too incurious to care much about actual governance, so he won’t get in their way. All they need is for him to sign whatever they put in front of him between rounds of golf.
Trump likely didn’t know much about Project 2025 – but that absolutely did not mean it wasn’t the plan all along.
They’re planning to dismantle the Department of Education. Vouchers will be a moot point soon.