They have started a debate between to alternatives the premise of which is wrong. The issue isn't is it physical or psychological. The issue is for those who get lingering post-viral symptoms how many will recover without ANY intervention and how many will remain ill. For those who remain ill how well does a psychological intervention work? What matters is what is factual. No argument will ever be concluded one way or the other. And it is the province of true believers to continue on in the vein. We need facts. We need science. The psychological proponents have neither. And so they deflect, obfuscate and use ad hominem attacks when pressed.