I went into practice tool, found a distance of 22 flashes which is 8800 distance. I then Q'd that distance and it took 39 Q's, approx. 225 range which. Which is one of the values the dataminer found. Also confirmed that third Q and first two Q's travel the same amount of distance.
The Wiki's E range was also listed as 325, but when I traveled the 8800 distance it took a little bit more than 35 E,s which is 250 range, which also matches what the dataminer wrote.
I can spawn a target dummy, teleport to the exact space as the target dummy, and then move exact distances using the above confirmed numbers. That's how I got the range of W and Q damage radii. Which confirmed the dataminers other values.