In this case, "intact" means that the tissue was preserved in shape long enough for the sample to fossilize. Not that it actually survived in original chemical composition for 100 million years.

Does any DNA survive that long? I thought I'd read somewhere that it gets destroyed relatively quickly.

Half life of 521 years.

At least add a link...

http://www.nature.com/news/dna-has-a-521-year-half-life-1.11...

From this article, it would appear that DNA would probably be unreadable at around the 1.5M year mark, well short of the 110M years that would be required to recover DNA from this dinosaur.

There was this, recently: http://www.sciencemag.org/news/2017/04/no-bones-no-problem-d...

That's only 50,000 years, though. Also, no idea what the quality of the DNA is at that point.

No it doesn't. Yet Neanderthal DNA has been sequenced.