Not sure which bit in particular, but the YouTube response says what I was trying to say - you need to demonstrate that something was legally questionable before they will comply and identify a user.

With my forum, I ask the disgruntled user to have their lawyer contact me as a form of pre-action discovery. That weeds out the ones complaining without a leg to stand on and gives me a little bit of protection. The timestamp and IP address (at least with Australian ISPs) is rarely a slamdunk, and it pushes the real judgement on ISPs who have established systems, and police.

BTW, this is just incredible: "An Economist/YouGov poll in late December 2016 found that 46 percent of Trump voters and 17 percent of Clinton voters thought Pizzagate was real."