And I said it a couple of yeas ago.
Anecdotal evidence from users on this site show mixed benefits when adding a USB cable between the Pi and dongle.
If yours works - keep using it, but did you actually do a side-by-side comparison? (I did).
Did you read what you linked?
Can you see the bit about 2.4GHz?
ADS-B operates at 1.09 GHz
Also, 2.4GHz is well above what an R820T/T2 can receive.
Unfortunately, the white paper you’ve linked has only compared “USB-3 Not Connected” to “USB-3 Connected / operating”, but not “USB-2 operating on USB-3 port”. It’s probably reasonable to assume that a USB-3 port operating at USB-2 is not worse than a native USB-2.
Additionally, the white paper shows only one broard band spectral plot (fig. 2-2), but that was made by “directly probing one of the USB 3.0 transmit-pair signals”. ie. it is the power spectrum of the data stream, not what is radiated.
In summery, I have done what you suggest, and with the components I used, I could observe a very significant drop in performance.