Furthermore, once again, we do not 'increase' error rates, we control them.
Indeed, based on the example on page 13, it seems the authors themselves confuse real theoretical risk with Type 1 error control.
We do not want to reduce the error rate inflation in preregistration - we want to control it.
If the error rate is not controlled, I do not know how severely a claim has been tested, and I can not use the claim to decide how to act as a scientist. The authors seem happy with the fact that preregistration reduces the Type 1 error rate even in an exploratory study. But I am not.