> There is enough until the company hits the early 2020 approximate headcount

This is an incorrect way of looking at it. Microsoft was growing at approximately 10-15% headcount year over year prior to COVID. If they reverted to the approximate 2020 headcount that would mean an overall decline in growth in comparison to a situation where COVID did not exist.

I didn't suggest that they revert to the approximate 2020 headcount. The question in the GGP was, "How much of the Covid headcount growth is there to revert?"

And the answer is, "Calculate what would have happened without Covid, assuming previous growth patterns, and compare that to current headcount."

So they would revert to the 2020 headcount plus a guess as to non-covid influenced headcount. A reasonable guess there is "about the same amount on average as pre-Covid growth."