99.9% probability it's a forgery. But many people stand to make a lot of money if it's sold so they'll try to find enough experts to say it's legit and everyone wins.
But I'm not good enough to disentangle the mystery of originality and put the problem in concrete terms.
But what does “worthless” actually mean? Does it mean something you happen to personally dislike? Does it mean something else?
If only there was a NFT assuring it's provenance.