I know this almost touches some other questions already asked here, but it's actually aligned a bit different. This is not about DNG vs RAW, rather just about the demosaicing step in the conversion. It seems like thisthis answer implies that some irreversible demosaicing of the bayer patter takes place, but other sources around the Internet states that it does not. I'm not referring to the linear DNG, but the one that Lightroom converts RAW files to.
I've also tried to dig into the specification from Adobe, but so far I've not been able to find a definite answer.