Skipped over all the replies to post this:
This is something relatively recent in FFB. I believe it got popularized with Belichick's NE teams. Teams, in general, play MUCH more coy with injury information than they did 15-20 years ago. Players are in on it, too -- they are coached what to tell the media about their injuries.
What used to be more common is that teams/guys would minimize their injuries so that tacklers wouldn't key on their knee or shoulder or whatever. What seems to happen a lot more now is that teams/players implicitly exaggerate injuries so that opponents have no idea whether or not they'll be facing off against a given player.
I think a lot of NFL teams (and IMHO Shanahan and Belichick were on the leading edge) are very attuned to the FFB community and the news that's generated for that audience. For real NFL squads, fooling the FFB world, it's turned out, is a great way to fool your real-life opponent.
My memory (maybe selective) is that injury info was generally much more straightforward in the 1980s and 1990s. And when BS was floated, it was typically that someone was healthier than they really were. In fact, I remember it was a relatively safe rule-of-thumb to bench Questionable guys. Now, the reverse is true more than ever.