Burning coins to try to stop the price crashing is a complete non sequitur.
One of the core principle of bitcoin is it is decentralized and censorship resistance. There is no central authority which can exercise control over other people's money, burn coins, freeze address, reverse transactions, and so forth. There is no majority rule which can prevent someone else from doing anything they like with their coins, including dumping them on the market if they so choose.
If you burn Satoshi's coins, you have effectively destroyed a core principle of bitcoin. The number of people who would sell up and move their money elsewhere would crash the market harder than Satoshi's coins would.
There are plenty of centralized scam coins out there you can put your money in instead if you desire.
This basically. Bitcoin is not going to do things that occur beyond its realm. How much or how little fiat people are willing to trade for one bitcoin is completely irrelevant for Bitcoin (software). To Bitcoin it matters nothing what its price is in the market, there is zero reason for an idea like this to push forward. And if Satoshi comes and sells his/her coins, there will be cheap bitcoin for a little while, so what? This doesn't matter to Bitcoin, the system will keep working as designed, and that is all that matters.
The so called "worry" is a human external factor, if you are worried don't invest in it, simple. Nobody is forcing anyone to. What the Paxful founder wants to do is a form of "State" (or institutional) intervention, someone who detests the free market would suggest. Again comes the Austrian economy advise: The best thing you can do in the face of a problem, is do nothing. Let it solve it itself, the market adjusts.
Truly the answer is do nothing. There is no point in burning someone else's coins (artificially, beyond decade old established rules) for whatever reason, and you are welcome to sell yours if you want, Bitcoin doesn't care, only you might...