The blueprint will be open source and you could technically build it yourself if you have the patience. They are quite proud of how few parts are actually involved in it
I respect that point of view. But to me, it being easily hackable and lacking the surveillance features of all other modern printers[0] is still a strong selling point and I hope for the project to succeed.
And that's entirely fine; it can a positive thing without being open-source. An institution can be a positive thing without being democratic. A food can be delicious without being a meat.