Yes, it means exactly what @Kingsley describes - you can't build a runner deck good vs both Rush/FA and Glacier anymore, so you choose. Most of the field was going to be Rush/FA, so the Glaciers had really smooth sailing.
Problem is, I'm not so certain this is a good thing for Netrunner. Even in extremely good matchups, you're still victim to variance - runners perhaps a bit more than corps. Add to this that Runners are the ones who are more reactive, as far as deckbuilding goes. Going from this, if you create an environment where you can't have a reasonable matchup against everything, then a significant amount of time the game will end up being unfun.
I guess what I'm saying is that I feel the ideal state of balance for the game is a situation where runners decide between "reasonable matchup vs everything" and "better vs. something at the cost of worse vs. something" (with the tradeoff being a conscious choice). Now, obviously last year wasn't there, this year isn't either. Will O&C have enough runner tricks to achieve this? We'll see.