This hits home. I recently quit a job (~2 months ago) that was exactly the situation described. I had never encountered micromanagement to that degree before and was initially, naively, willing to accept my boss's criticism as "learnings" for myself. He was of course totally unavailable until ~6PM, after which he would dive into the weeds on my work product for the day. "This chart's axis aren't clear enough". "Line…
Micromanagement is usually more about the manager taking a normal-sized task and breaking it up to steps that are too small to make sense on their own, then checking in with the employee on every step. This blocks the employee from developing their own method of work, applying creative thinking, etc.