It’s not a 52 though, it’s a 55. Seat tube length has no bearing on fit whatsoever on its own. It only affects how much seatpost you’ll need exposed. I had a caad12 which was like 57cm ctc and I’ve got a custom Ti frame with almost identical geometry except it has something like a 49cm seat tube. Saddle and bars are exactly the same place, same stem length etc.
It’s not a 52 though, it’s a 55. Seat tube length has no bearing on fit whatsoever on its own. It only affects how much seatpost you’ll need exposed. I had a caad12 which was like 57cm ctc and I’ve got a custom Ti frame with almost identical geometry except it has something like a 49cm seat tube. Saddle and bars are exactly the same place, same stem length etc.