This is a fairly well known issue Peter Principle (https://en.wikipedia.org/wiki/Peter_principle)

> The Peter principle is a concept in management developed by Laurence J. Peter, which observes that people in a hierarchy tend to rise to "a level of respective incompetence": employees are promoted based on their success in previous jobs until they reach a level at which they are no longer competent, as skills in one job do not necessarily translate to another.[

Yeah sure but the point being these people never wanted this role and not only t company lost them as productive ICs to some other role but they lost them altogether (great engineers with deep domain expertise)

Yep. I've see this happen. People who are good at coding may actually want to code, not write "tech specs" and have review meetings all day.