He starts by citing two responses from what he considers to be people he disagrees with. These are "it's not happening" and "it happens only to bad people". He never actually addresses these claims directly, and instead heads off on tangential matters.
Kasparov appears (probably correctly) to be worried about "groupthink". Yet who can point me to a position that has actually been silenced? Those who believe in the lab theory, that vaccines are toxic, that covid19 is a hoax - these people all have hundreds of thousands if not millions of people reading, listening, watching presentations of these views. Are they a broadcast TV network? No. Are they on MSNBC? No. But how on earth can anyone seriously make the claim that these sort of views (or any others) are excluded from public consideration?
The major reason why only 58-60% of the US is vaccinated against COVID-19, for example, is precisely that anti-vaccination viewpoints have been widely distributed and viewed, despite being completely non-establishment.
Kasparov cites Thiel as someone who has apparently suffered from "the politics of personal destruction". Excuse me, but just how has Thiel suffered? He still publishes books, appears in what I can only assume is as wide a selection of media as he chooses to (given his historically rather reticent public persona), is frequently asked for comments about matters he appears to the world to be knowledgeable about, and continues to enjoy the benefits of his prodigious wealth (including that IRA).
Then Kasparov dives into lab-leak theory, and the way that many people considered this theory to be "pro-Trump". If his point was merely that it was rather pre-emptive to declare this idea false, it would be an excellent point.
However, that's not his point, and he chooses to ignore the way in which Trump attempted to use "the China virus" and the lab-leak theory as cover for his own administration's ineptitude, which creates a context in which a disdain for lab-leak theory is sort of inevitable. That context is arguably more important than anything else about this episode, particularly given that the origin story of SARS-COV-2 was always going to, and now is, receiving about as much scrutiny as anything like ever could (Chinese reluctance notwithstanding).
If Kasparov had actually addressed "it's not happening" and "it only happens to bad people" effectively, maybe this would have been an interesting essay. Instead, I find it intellectually weak, and basically a great example of a conclusion ("there's a threat to free flow of ideas") in search of some rather weak evidence.