Have a look lenovo forums [1] (also linked prominently from original article), where OP has following to say:

  I am attempting to install ubuntu 16.04 on my yoga 900.
  The bios can see the 512 gb samsung hard drive and so can Windows.

  The ubuntu installer can not see it at all. 

...and first person to reply adds:

  I have the same issue with the 900S model. 
 
  I have tried the newest kernel 4.6 but linux doesn't
  even list the pci express device in lspci.

So no, positively not the 3.2.x kernel to blame here.

[1] https://forums.lenovo.com/t5/Linux-Discussion/Yoga-900-13ISK...

Right. Thanks for that. I am reacting to the claims that it's "locked by Microsoft". This looks to be missing Linux support for an Intel device. Sad, but not unusual.

Someone should inform the foss-boss! when his website come back up.

This article could certainly use some clarification. I bought a Lenovo Yoga 500 two weeks ago and had no problems whatsoever with installing Ubuntu 16.04 after setting the UEFI to 'legacy' and nuking the complete drive after making a disk image backup for warranty purposes.

Did I dodge a bullet here? It came with Windows 10, but perhaps it wasn't this 'signature edition'.

That's a total different thing, I did the same with my Lenovo G50-80 laptop, but the problem with the model in the thread is the Signature Edition and the BIOS lock, it's different from normal UEFI stuff.