Not sure who RP is, but I think they mean first Tampa team in major pro sports (I bet, say, the Storm have finished 1st at some point).
And you can actually extend it to the first team in Central FL to win the regular season in any of the four major sports (the Magic have never done it either).
There's a bit of a technicality here, as the Bucs tied with Philly for best record in the league in 2002-2003, but since Philly had the tiebreaker and home field in the playoffs, I'd say we didn't win that one.
So this is really special. It's a little odd that we've seen two championships (1 SB and 1 Cup) but zero regular season champs -- statistically, they're equally likely.
Frankly, this has been one of my favorite sports seasons ever... and I'm it sure it's going to retain that status even if we don't win the Cup.