I don't count PC in this for one very simple reason, most console gamers don't bother with PC. If a PC gamer wants to play exclusive X and he needs a console, he will either bite the bullet and pass or buy said console. I know I know, it is still pushing the console sale. The problem with considering this multiplat is the PC will always be in a different league than consoles. MS and Sony get most of their profits through software sales, so even if this PC gamer buys one or two games for said console, 99% of all other games will be bought for their PC. This makes the whole area a "small fish is a large ocean" type of situation and has little to no impact on the grand scheme of things to said brand.
A console gamer looking to buy one console however is going to see what CONSOLE exclusives are available and what appeals to them. The rest of their software choices will likely follow suit and it makes a much bigger impact.
So by definition yes, a PC and console release isn't an exclusive. But in the discussion of consoles this is really a moot point. Now I know this will always be a grey area due to the fact that there are some people out there that do game on PC and buy consoles for exclusives, but it is never as large a user base as fanboys like to claim. Many of the people (not all) who claim they do this are simply just fanboys trying to make an argument for why they can play the other console's exclusives, even though they don't own a gaming rig or it isn't even powerful enough to matter.
I went PS4 due to PS4 exclusives being more my taste with Final Fantasy XIV, Killzone (hate on haters), Infamous, Driveclub, The Order, Bloodbourne, and Uncharted all catching my eye, not to mention the countless other franchises and developers that come with the PS brand. Meanwhile I buy all multiplats for that platform as well. Had I owned a good gaming rig, I can assure you 99% of my games would be purchased there with my console being a last resort.
Ok so it wasn't so simple to explain as I thought, but it is the truth non the less. =P