I believe Gulfstream International Airlines renamed themselves Silver Airways in Dec 2011, after the assets were purchased by Victory Park inventment group. Looks like some of the current information hasn't filtered through the United system.
DEN
This is correct. There's nothing like (nearly) 2 year old info. This really matters when they try and tell you that no PQM/PQS are earned on Silver. So far, I've had success showing them the UA Express or Continental Connection branding on my BP and getting credit. Here's hoping they don't fix the bug.