Yes. It's rare but possible; soft tissue does fossilize under the right conditions. And that is what this is -- fossilized soft tissue. We have examples of such going back to the Vendian.
No, which is why no such dinosaur has ever been found. Not even this one.
The article is somewhat misleading. An article on the website of The Society of Vertebrate Paleontology makes it clear that the "soft tissue" in the fossil is not actual "soft tissue", but is remarkably detailed FOSSILIZED CASTS of what used to be soft tissue:
Some of Leonardo's startling features include a three-dimensional rock cast of the right shoulder muscle and throat tissue, along with fossilized skin and stomach contents. The muscle casts will shed new light on dinosaur appearance and movement, and the stomach contents will add to information on Late Cretaceous environments.The detail photos make clear it's rocky fossils of the original soft tissue, not actual preserved soft tissue:
Likewise for the stomach contents, which are fossilized and not "fresh":
Even with the most modern embalming methods and a completely dry atmosphere (i.e. Egypt) it would still only last thousands of years.
Scientists would have to do alot of explaining before I'll buy into that age.
Sorry, this fossil, as rare and special as it is, is hardly a violation of standard science. No "lot of explaining" necessary.