Both of those links you posted were to Cliff Bleszinski bad mouthing the PC. It's quite a leap to say that his opinion translates to Epic's corporate policy.
Well, Dude Huge certainly isn't as high on the company as I thought he might be. Still, he is probably at least a lead designer. There is possibly some truth in his statements that can be apply to Epic overall.
So, you're talking about one or two games (if you count Gears 1) that are 360 exclusives. I hardly consider that a strict corporate policy.
Well Epic hasn't release that may number of titles by themselves. In recent times it was Gears1, UT3, and Gears2, so thats 67% based on a 2:1 ratio. Admittedly, Gears1 was ported to PC so its really a 50% based on a 1:1 ratio. That is hardly evident of a company policy, but it does seem to be the foundation of a trend (especially if we factor in the success of X360 Gears2 verse multiplaform UT3). We also know that Gears3 is coming, and probably X360 only. As for the other new IPs, I suppose we will have to wait and see, but again I won't be surprise if it swings X360 only.
I think it's safer to say that Epic's corporate policy is to release on as many platforms as makes sense.
Then Epic, like many other companys, will support the PC less because of the perceived piracy. This comes right back as support for Epic to start its trend of pro-console development. Epic may not stopped PC game development altogether, but it is possible that they might support it only in a small degree. It is speculation, but I haven't seen Epic show major interest in PC gaming themselves, and it is mostly others that defends Epic's interest in PC gaming.