I'm curious about the title on this submission. I thought TrueTime had unusually strong guarantees about accuracy that don't seem to be called out in what I'm reading on the linked article.
If you ask for the time and get A, and then ask for the time again and get B, then Truetime guarantees that A is less than B.
Obviously, in a distributed setting this is much easier to do if you have accurately sync'ed clocks, but that accuracy goes to reducing the uncertainty in the time (and hence making truetime faster) rather than providing accuracy.
"Please use the original title, unless it is misleading or linkbait; don't editorialize."