Updating the US gold stock to contemporary values would just be an accounting adjustment. In my view, I don't see how it would impact the size of the national debt. Unless the US Government sold off some of the revalued gold and applied the proceeds to pay down the debt. Which isn't very likely, given government behavior in the past. In any case, the rewards of revaluing the US gold reserve would be less than a current single year of federal budget. While inflationary, the amount involved would be less than several of the stimulus measures carried out in the Covid era. So it wouldn't be hugely inflationary.The last time this was done in the 1930's the value of the dollar effectively dropped about 50% overnight. That would effectively cut our debt in half. While that might not be the impact this time, my current understanding is that it would make the deficit and debt appear to be lower but would also effectively transfer a massive amount of wealth from the working/middle class and the poor to the ultra wealthy.
We can't relate the 1934 model of dollar devaluation to the contemporary setting. Because deflation was the central economic problem in 1934, and inflating the dollar was a tool used to fight deflation.
There could be some argument that a massive sell-off of government gold would lower the value of the metal across the board. Something the government would likely not like, unless they were able to sell the entire lot at once. Which seems unlikely. A sale that lowered the value of gold would be contradictory to the goal of realizing the full value of the asset when sold over time.
Then there is the issue that gold has steadily risen in value (with a few bumps in the road) since 1974. The government isn't losing money by holding onto their gold. Theoretically, the longer they keep it, the value will at least keep pace with inflation. Once gone (ask the British), there is no more experience of appreciation.
With all the foolishness going on in US government these days, anything could happen. After all, we have a former hedge fund manager for Secretary of the Treasury. Stripping assets is one of the things that hedge funds do to get easy money.
Just my opinion.

this idea!