Naturally this means a different user agent and finger print which could ultimately mean the script is fed a different page altogether. The odds of that are probably low but still; someone could have a really shitty website that uses hundreds of trackers but could serve WebXray something completely without them.
I would like to see this type of stuff as web browser extensions. That way we can get the exact, most correct information possible. Also would simplify a semi-convoluted build process that seems to have tripped up a few readers.