Sure, you can stretch the definition that thin if you want, but "win" is in the phrase, and the straightforward definition is the literal one: paying to achieve the win condition.
But that's irrelevant. Even by your more general definition, SC still doesn't offer any "progression" to speed up, or "mechanics" to bypass, so the point stands.
Ummm...you can buy ships.
Buying ships is one of the core central aspects of space sims. They are one of tbe main rewards in game and they are an item that may take weeks or months to achieve. Indeed, some are so rare you might never find one in game.....
Except you can buy them now to have for the low, low price of $15k.
That is a huge chunk of the game these people have managed to bypass, and done so before the game even launches.
Is there any point to trading or mining if you already have the ship you want? Are you going to risk your £850 investment by fighting anyone who has a chance of winning? And as for explotation....how long do you think it'll take a few thousand explorers to thoroughly explore a system and find all the handcrafted goodies? How long do you think it'll take them to explore ten systems? 100?
To keep it short, CIG cannot possibly release content quickly enough to keep all the players engaged in the end game stage. People buying ships now just allows them to bypass huge chunks of the game or to sell later for money. People being able to buy credits allows them to bypass huge chunks later.
It may just be time, but time itself is an in game balancing mechanic.
SC is PTW...you pay to bypass huge chunks of the game, to avoid large parts of the gameplay and to give you a competitive edge over other players, important given that PvP is supposedly going to be a core part of the game.
SDC are already salivating over the carnage they'll be able to wreak. There's little wrong with that, but don't expect those players who are in it just for PvE to be happy and don't expect those players who expect honest PvP to care.
The decision to sells ships is understandable from a marketing point of view....but the decision to make mid- and end-game ships available is so utterly and inanely stupid that it makes you wonder what Chris Roberts was thinking and is uet another sign of his incompetence as a game designer and his inexperience at designing multiplayer games.