Me too, but, we seem to be in an extreme minority
They were clearly referring to Capaldi, but they wouldn't know about the metacrisis. The Time Lords see thirteen TARDISes and assume that all of the Doctor's natural 13 incarnations have shown up to the party. Little do they know that the '13th' Doctor was technically the fourteenth, and that Tennant counts as two. Whether Smith's Doctor noticed Capaldi turn up and thought, "Hang on a minute; I'm the last one - who's he?!" remains to be seen.
I think you misunderstand what we are saying - that the line "No Sir, all thirteen" is spoken
by Peter Capaldi.
Yup, and I've rewatched it a couple of times, to try and correct that belief, since it seems everyone (except you and me) believes it was the General who spoke the line, and it still feels like Capaldi is saying it.
One Day I hope to be the Man my Cat thinks I am
Where are we going? And why are we in this Handbasket?