Nope, we don't delete old posts, so we have posts still here going back to when the community started in 2001.

The post numbers in a member's profile aren't always 100 percent accurate, due to the way the system maintains that number. We can have the system update the number to bring it in line with the actual post number, but because of our huge database and sheer numbers of members, this process takes a very long time and so it's not one we regularly run.

Without knowing the exact member you're talking about, I couldn't say why that number differs for that person. Could be they asked a few posts be removed, could be some of their posts were part of a larger thread that was removed, or could be some else altogether...

DocJohn