Context clues. If everything before and after that were referencing shooting 3s then maybe that is as well.
I don't see what averages matter in this case. Keep in mind games where he plays 4 minutes count just as much as games that he plays 35 minutes. He is in a 3 way split for PT with Mario Chalmers and the option of having Wade or LeBron run point.
But still Bibby, Mike Miller, James Jones, and even Mario Chalmers are capable of knocking down several 3s a game. However unlike Dallas, Miami doesn't live or die by the 3. They focus on physical D and attacking the basket. When they are not taking many 3s then those guys get loss opportunity to prove what makes them so special.
BTW I'm still waiting for you to explain what holes the Bulls and Heat have on their roster.