Maxwell Everett wrote:
The script specifies, "a skeletal figure -- long dead and decaying."
What we saw in the episode is definitely beyond the advanced stage of decomposition, since the advanced stage is the "end of the active decay process". If this corpse was at a stage before advanced, it wouldn't be dry to the point where it's skin has flaked off the bone.
Also remember that this is a writer who wrote a planet's temperature being -291 degrees celsius (That's below absolute zero) and assumed that we would never be able to solve Fermat's last theorem.