Actually, that is false.With the new 256gb M2s coming with an empty chip slot, this sounds like it might be an even easier upgrade. Has anyone heard if anyone has tried? I suppose only Apple RAM would work, which would render this moot?
the 256gb M2 uses a newer nand chip (same as A16 in iPhone 14 Pro / Pro Max)
it's harder to get, that's basically the first issue.
the second issue is, there are a handful of capacitors you'll have to solder on for the 2nd chip socket if you would call it, it's really just soldering point, not something user can put on. You'll need some decent level of knowledge to use heat gun & soldering gun for it to work. If anything, I would recommend buying the 512gb model, and upgrade to 2tb on your own.