Wind tunnel accuracy

https://www.cyclingweekly.com/...4360/amp?jwsource=cl
In this video,filmed at the Boardman wind tunnel (UK),I photoed the file attached.
This shows a~5% CV in drag force,but only 0.7%CV in CdA.
As CdA is derived from the drag force,this doesn’t make sense to me,
or am I missing something?

What photo?

Don’t know, but CV for drag may be over small time intervals (like 1s) and CdA is averaged over a long interval.