I don't believe anyone claiming that Satoshi is still alive. There is zero chance any human who put so much effort into creating something would remain silent while it became a $2 trillion phenomenon that succeeded beyond their wildest dreams. Satoshi is certainly dead.
I'll at least agree that I don't think any other living candidates for Satoshi make any sense. I can't believe someone who started a brand new influential field of study could fully exit from it while fully avoiding the proceeds from it, as would be necessary to believe in any other living candidate.