I really want to know what exactly their criteria for determining whether or not a player decided to romance a companion, because I think those ~98% sound suspiciously high.
If we disregard that romancing them is something that happens towards the end of the early access campaign it already means a great number of players are removed from the equation because they haven't reached that part of the game.
Then there's the fact that half of the companions are ready to pounce on you at a minute's notice. You don't even have to seek some of them out; they'll be the ones asking you.

I have a feeling that the 98% just are the amount of players who outright were presented with the offer in an accept/decline format and chose to take up the offer. In reality it's probably a way smaller percentage of the players who chose to go with that specific route.