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My hunch is those are screws rather than bolts, and they are turning without backing out because the plywood base/core under the fiberglass is not what it used to be.
You may be able to get a flat edge under the head of the screw/bolt and see if you can pry it up a bit. If it comes easily, then grab with a vice grip and complete the extraction.
I hope my hunch is wrong, but if not, you'll need at a minimum to pot those holes with a epoxy and re-tap them before remounting the toilet. Hopefully there is enough solid core left in there.
Good luck- John
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Pacific Seacraft Crealock 31 #62
NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT