Even if a file is revealed to be a transcode here, I wouldn't count on the people who reupload the files to share this information with their downloaders.
There's transcodes as old as time itself because of this, and they keep getting spread around even if they would be exposed as such on this forum. So if I could vote, I'd definitely say a 100% ban on transcodes, especially concerning new releases where we have a better chance of stopping transcodes from even starting going around, or, if not for the whole forum then at least for the lossless section, since downloading a large album and then finding that its a upsampling of a 192kbps file is just ridiculous.
But really, since people insist on using lossy formats for music, at least we should be able to guarantee the quality of those lossy rips so people get what they think they're getting.