I haven't tried it, but given that the tool used takes git into account, I find it more likely that maybe the 1.2M number includes moved and deleted lines (i.e.

I haven't tried it, but given that the tool used takes git into account, I find it more likely that maybe the 1.2M number includes moved and deleted lines (i.e. it counts all lines ever added in the history of the project). That's still just a guess on how OP got such a number.