I don't think the author completely feels this way. He feels Typescript is the VHS to his Betamax: the approach that won out despite being technically inferior.
> unfortunately, I see that nowadays, TypeScript won. The idea of strict type-checking for JavaScript is less popular than in 2019.
> [Typescript's types] give people a fantastic tool to cover existed code with types but doesn’t force to re-design it to make it safer.