I'm no apologist for IBM, but I have to point out that the ONLY "advocacy outfit" "outraged" by this is CCIA. The same one who helped bring the EU antitrust suit against Microsoft way back when. MS consequently bribed them several million dollars, and since then, CCIA has been an extension of MS PR.

From wikipedia (which I believe largely to be correct):
Bbout 'mainframe': "the term usually refers to computers compatible with the IBM System/360 line, first introduced in 1965. (IBM System z10 is the latest incarnation.) Otherwise, large systems that are not based on the System/360 are referred to as either "servers" or "supercomputers"."

So yeah only IBM makes IBM computers, shocking.
Clearly there are many other manufacturers of large servers/supercomputers that can compete fine with IBM, and in fact I bet IBM isn't even the biggest in that segment, so this article is a bit cheeky in its insinuations I'd say.