obviously you DIDNT READ IT
The answer - they DON”T KNOW HOW - THEY ARE IN THE “searching for alternate explanation stage” A direct quote from the paper is found below
The structures may be the result of an as yet unidentified abiotic or geomicrobiological process that could explain their presence in thousand- to million-year-old fossil remains.
what he study confirmed was that preservation of non-minerealized remains has occurred in serveral verifiable instances....this in no way says WHY something is preserved for a supposed 80 million years (see above comment from paper)
And the last resort of when losing an argument is to accusations and slander - your statement of “creationist misrepresentations” -— what have I misrepresented? And from who?