There are two ways for things to become fossilized, either replacement of the original substance with new mineral or covering over the object and thus preserving it.
It appears the tissue in the article was of the second kind.
Modern species? How modern? Mammoths, Middle Ages, Monday last?
“Why are there not human and horse skeletons found that are fossilized to an equal degree?”
You haven't offered any info. to suggest what it is you're asking. Why would we expect them to be fossilized to an equal degree? Or not?
But according to the idea that all animals were created nearly contemporaneously, wouldn't one expect to find fossils of all types of animals in all strata possible before they went extinct, and all in the SAME states of fossilization?
Yet this is not what scientists observe. They find no bones of humans or horses that have been fossilized to the extent that dinosaur bones have. They find no unfossilized bones of dinosaurs.
This is exactly what one would expect if fossilization took a long time, and humans and horses have not been around that long.
This is exactly what one would expect if bone didn't survive unless partially fossilized, and dinosaurs have been extinct for a long time.
How modern? I mentioned horses and humans.
Why would we expect them to be fossilized to an equal degree? Because if Creationism had any validity (which it doesn't) then all animals lived at the same time and we would expect them to be fossilized to an equal degree; yet they are NOT.
How do you explain this?
So far no Creationist has even attempted an answer to this very apt question.
Why do we find only fossilized dinosaur bones, not ever any unfossilized bones?
Why do we NOT find fossilized bones of horses and humans to an equal degree?