Definitely not, there's a specific website for uploading stuff, it's not done trough iTunes. If you're a musician or a small label you're gonna use something like CDBaby or DistroKid though, which uses an API or something equivalent.
I imagine it hasn’t been the case for any new or remastered music added in at least the last 10 years. They upgraded to 256 kbps in 2009 so CD-originated music surely would have ended by then.