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Assuming you're correct that the commenter is unaware of their communications deficiencies, then as much of your confident criticism should be directed at a manager who would silently change a spec sheet for some reason, and not coach the employee on why that was needed.

If it was truly a manager, where the main role of their job is to manage the performance of their employees, then they failed here.

The boss also tried to fix it in the lowest effort manner possible, without even checking the results.

People try to fix things that are perfectly fine all the time.

People often apply nonsensical standards to things.

Who knows why? That's my point, its not us