I agree completely. It will be interesting to see how his book fares. Making the FOIA request now, instead of during the buzz of the last couple of weeks, or even earlier as he was ostensibly researching his book is a stroke of genius.
FOIA requests take forever to adjudicate. If he's looking for that material for his book, the publication date is somewhere around 2018.
If, on the other hand, he doesn't want to bother with the FOIA material and merely engage in fact-free fear-mongering, then this is perfectly timed.