As far as know, the orbital inclination [and latitudinal range]
of the ISS were deliberately established
to accomodate both Cape Canaveral and Baikonur launches.
The ISS I believe was established in its present orbit so as to make it possible to accomodate and receive the necessary Soyuz/Progress spacecraft with the minimum expendature of propellant
from their boosters and their "Service-Modules".

For Soyuz/Progress spacecraft to be launched from Kourou, or from NE Australia, would not necessarily be an advantage, since you would have to expend more Service-Module propellant to adjust your orbital inclination to match that of the ISS. Maybe even a prohibitive amount of propellant.

I'm not sure I would accept this "latest report" about Russia's departure
from Baikonur as anything more than
published rumor. Space.com is notorious for publishing unverifiable
"space" scuttlebutt that often proves incorrect.

Jacob