I've certainly heard it said that if you're a big tech company, you are already infiltrated by state-sponsored hackers. But since I've never seen one of these red-team reports, this synopsis provides a lot of color on how people can get around inside the network, once they get in, that I wasn't aware of (obviously I don't work in opsec).
Too bad for Palantir that this got leaked, but perhaps it can be instructive for many of us.