So one professor of medicine at Oxford says that long Covid is idiopathic. As Bell is an academic professor and not a clinician in the field handling patients,

So one professor of medicine at Oxford says that long Covid is idiopathic. As Bell is an academic professor and not a clinician in the field handling patients, or a virologist tasked with studying this particular situation, his opinions are educated but not necessarily informed enough to be authoritative. And, of course, no amount of theorizing negates the fact that a great number of people with Covid seem to be suffering from prolonged and in many cases debilitating symptoms from, well, something that didn't cause them before these people had Covid. And a great many other doctors very clearly don't share his opinion, including actual practicing doctors in hospitals and surgeries and virologists. So as a "gotcha" political point against all these "sky is falling" liberals, it's not actually very useful. What it sounds like is right-wing contrarians looking for any authoritative figure to bolster their claims that all the sick people and dead people didn't really die or get sick and stay sick, or if they did they were already sick, so they can simply return the economy - which is the only thing they give a shit about - to making them money. It's not actually very convincing or compelling if you're not, y'know, a free market loony or a sociopath.