While your theory is correct, it may not make much difference in the long run.
If you spot meter from a distance, then you would get the appropriate reading.
If you used an incident meter from the head position, it likewise should take it into effect.
My meter has a "dome" which can be retracted.
You can get slightly different readings depending upon whether you have the dome up (which is catching all light, including bounce back from around the room, versus retracted which is more precise, but in the end, the difference is fairly negligle.
Mark
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