update:
響macrumors有個叫自己做appleaker既人咁講
There still seems to be a bit of confusion, hopefully this clears things up:
Since they are SO-DIMMs, you can of course upgrade the RAM yourself.
Like the iMac Pro, Apple recommend that you upgrade the RAM through Apple Authorized Service Providers only.
The bottom panel does not open in the same way as the 2012 model, and requires tools to remove.
Removing the bottom panel voids the warranty.
As for the ease of swapping out the SO-DIMMs once opened, I am told that it may require some disassembly, including removing the fan and logic board.
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Unfortunately this is not the case, as I've said. They do not want users taking apart the machines, which is why opening it up will void the warranty and they only advise for the RAM to be upgraded at Apple Authorized Service Providers.
In addition, upgrading the RAM requires tools and disassembly. They are not claiming that it's user upgradeable, they are stating that it uses SO-DIMMS and therefore can be upgraded.
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屌佢老味
如果係真的話真係冚家鏟黎