I assume it's factory and it's made to mount that weird-ass front derailleur. It looks like he just pulled the front derailleur off briefly to show how it mounts and you can see it mounted in the other picture, look at the picture below. His notes say:

Note: unusual attachment of the Campagnolo front derailleur, see picture 11 and 12, I've never seen before




Anybody ever seen a similar front derailleur? Looks like a horrible idea, how do you remove those bolts from the inside of the seattube without going down from the top?