I also have GSX access. I'll expand upon this comment.
Removing the bottom of the new Mini requires a suction cup, it does not twist-off like the 2012's did. I wouldn't say they're tamper-proof screws like a previous poster did, they're just blind screws with grommets in the bottom cover that "snap" over the screws.
Unlike what another poster commented about the high-end having replaceable RAM, the high-end model DOES have soldered RAM, I saw part numbers for i5 and i7 CPU logic boards.
Drives could be upgradeable, except they removed one of the SATA connections to replace it with the PCIE connection for the SSD, the SSD also occupies the "lower" drive location if the build diagram is to be believed. So, you only have one available SATA connection, and that would be used with the upper drive bay.
How much more definitive information than that from Apple's service site do you need to have in order to understand the setup? (I posted VERY similar info in another topic the other day)
Nah, don't get all worked up about it. People will believe whatever they want to believe in. Just let them wait for a more picture oriented proof if that's what they want to see.