Handing over email metadata, or whatever your interrogator wants from you, will only cause them to shift the goalposts, or find something they want to find in the metadata even if it exonerates you.
There is no reason to cooperate with journalists with a slant.
I tend to agree with you, to be honest. Seems fairly clear that Carreyrou was going to conclude that Back is Satoshi, come hell or high water.
Kind of a disappointing piece of work from the guy who took down Theranos. His journalistic talents are sorely needed elsewhere right now.