I don't get it. Do you claim, that there is a difference between "lossless" and MS' "mathematical lossless"?
Can you guide me to a thread at HA, where this is discussed? From what I read in the thread Which is the best lossless codec?, this fundamental flaw is not widely known.
(About lossy codecs: No, they never reach lossless quality, even at extreme high bitrates. This is by design, as the used fourier transformations are numerical operations and are thus not perfectly invertible).