In 4 years, the author has raised 6 issues and zero PRs. The latest issue was raised last week to inflame this same argument and is 4x longer than any previous issue.
Eh, not to move the goalposts but five are doc fixes (one of which is about their company). I would have expected more from the author of this post.
I don't know him but most of his GitHub activity seems to be contributing to the ClickHouse ecosystem, including popular projects like this one: https://github.com/Altinity/clickhouse-operator
My point is just that he doesn't appear to be someone complaining and not contributing.