If the Fed were lending gold on a fractional reserve basis, a huge number of people would know about it: employees of the Fed, bankers, counter-parties. Why are all of them keeping silent? Why does the Fed endear such intense (some would say insane) loyalty? How do they cover the tracks of this huge operation (both in terms of people and dollars)?

Also, to believe this you have to postulate that:

1) Employees of the Fed are personally concerned about gold destroying the dollar.

2) They are willing to do something illegal (or at least unauthorized) to protect the dollar.

3) So they came up with a complicated, elaborate plan to manipulate the price of gold down that perfectly plays into the narrative of gold bugs (note the nefarious fractional reserve lending).

It's not impossible!