Nah. The originally translation is slightly different, but it's basically Luffy saying, "Well, it's not 'he'". Nami is confused, says "then what?". Zoro then says "Them...probably."
Which is very strange and how it's framed in it's own right, and has long caused confusion and suspicion as to what that means.
Well, *SPOILERS IF YOU AREN'T CAUGHT UP* Later it is revealed that Blackbeard has an "odd/atypical body type", after it is revealed he can wield 2 DF powers at once, the only person who can do that. There's other subtle references and hints, like his Jolly Rodger with his 3 skulls, throughout that suggest there is something unique about Blackbeard. He's also trying to acquire more DF, so we know he can absorb at least 1 more. Does he have multiple personalities? A conjoined twin inside of him? What?
But this scene is definitely the first reference that something odd about Blackbeard is detectable by those who can perceive it. That's the leading interpretation, but debate does still rage about what exactly Luffy and Zoro mean. But accurate translations make it seem to not make sense for them to be talking about his crew.
I, personally, think that Blackbeard has a mythical Zoan fruit for Cerberus(thus the three heads) and one of the abilities is that he can eat two more devil fruits. Plus, it would follow a pattern: The Dark Fruit being a logia, the quake fruit being paramecia, and the Cerberus fruit being a Zoan fruit. Thus wielding the three different type fruits.