That paragraph reads like an executive summary. It documents that they have been "shown effective", which would imply that data does exist. I consider "could" in this context to be scientific extrapolation of data.... not smoke and mirrors marketing and not false claims.
How grounded the extrapolation is to reality, well.... that's another question.
As has been discussed already, there are likely too many variables for anyone outside of a wind tunnel test lab to really verify performance....
But I for one am interested in reading FW28Z's observations.
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