I wrote about this classic crank gambit a bit about a week and a half ago, emphasizing that no amount of studies will convince a crank.
Now, MarkH at denialism.com takes on the same issue in more detail so that I don’t have to bother with David Kirby’s latest spew. Thanks, MarkH! The point is that, for people who’ve already made up their mind to take a position that already contradicts what large amounts of available evidence says, no amount of other studies is ever enough. The “just another study” gambit should be recognized for what it is: a delaying tactic designed to buy time and distract people from the already existing scientific evidence against the crank position. It’s a shifting of the goalposts.