The article is quite vague on how this is implemented. Does it require JS to be activated to work? That would be a big NO for anyone really looking into privacy, but could work for those who use TOR basically as a free VPN to escape stupid geoblocking rules.
And what will prevent DDOSers from just creating dummy requests without the intention to ever wanting to solve any PoWs? It will still allocate resources on the other side.
The sane choice would be to leave.