We have two at same time, one nuclear. The nuclear will be followed by two more nuclear at same time.I doubt that three carriers are being or will be built at the same time. They will certainly not build three 004 CVNs when it will be the very first CVN. You don't go into serial production when you haven't even tested your very first CVN ever.
And I don't think anybody thinks they will build three more 003 carriers.
So I think those interpretations aren't realistic at all. At most, it can mean that it's full steam ahead with the 004 that we are speculating they have already started to build.
Though I would be very happy and excited to be proven wrong because building three carriers at the same time would be a mind-blowing demonstration of shipbuilding prowess.