Admitting that you goofed isn’t bad and not necessarily admission of being credulous. Using your definition, anyone who changes faiths would qualify. Or switches political parties after learning or maturing.
With all your years on FR, saying something like this is an admission that you're either lying or you're brain-damaged to the point where you can't discern reality.
Considering your positions on FR over the the last couple of decades, I'll opt for the latter.