Not always.
The manager might completely disagree on the termination.
The manager might be being punished for not terminating underperformers so higher ups stepped in.
I guess my point is don't underestimate the amount of dysfunction in management.
I realize this is a cynical take, but management is largely about power and control than it is about furthering the business. RTO is a great example of this.
Here are some examples I've encountered over the years.
One manager used her directs as a dating pool.
Another one purposely hired a bad engineer because of stack ranking so they could protect the good engineers.