Not so!
"Scientists have extracted organically preserved muscle tissue from an 18 million years old salamander fossil. The discovery by researchers from University College Dublin, the UK and Spain, reported in the Proceedings of the Royal Society B shows that soft tissue can be preserved under a broader set of fossil conditions than previously known."
Their use of the term "fossilized" simply means encased in rock in this case.
"We came across the muscle tissue during our analysis of several hundred fossil samples taken from an ancient lake bed in Southern Spain. It was immediately identifiable by the sinewy texture visible under the microscope"
Soft tissue! Not mineralized. Were this sample even 20,000 years old it would have mostly converted to methane and leaked out of the rock by now.
“Their use of the term “fossilized” simply means encased in rock in this case.”
You’re going to have to do better than that. Find a source where the person who has examined the specimen says in simple language that they are the actual cells that were alive when the dinosaur was alive.
With photos.