I don't routinely visit their forums, either. In fact, this was my first visit, and less than five minutes of browsing was sufficient.
Why would you assume that the NVidia logo was a default avatar when most posts on the forum appear at first glance to have a question mark as the avatar?
How are you still unwilling to conclude that he's a NVidia employee when a post of his about the status of NVidia's internal bug tracking system is corroborated and followed up by a post from a moderator whose signature identifies him as another NVidia employee? Yes, Sandip might be only a low-level employee who has nothing to do with NVidia's business strategies with respect to Linux, but he's clearly not just some random poster. (And for you to suggest that NVidia might let a volunteer have access to an internal bug tracker suggests you know nothing about how NVidia does business.)
... by introducing equally unreasonable speculation in the opposite direction, without even putting forth a few minutes effort to gather real information. Being an apologist isn't really a good way to try to steer the conversation back toward more reasonable explanations.
edit: basically, you read 5-6 things into my words that simply aren't there. I avoid aggressive bickerers like you because I end up spending too much time clearing things up. You're primed to take the least charitable interpretation possible. I have better things to do than to deal with someone like you.
Anything is a better thing to do. I've wasted too much time in the past arguing with perpetually perturbed people to let it happen again.
There's no reason at all to doubt his status as a NVidia employee.