A chip the size of a grain of rice, cannot have too many different connectors on it. Which makes me think that it may be able to do one or two of the suggested breaches, but not all of them.
The servers in question were of the blade server model. That means highly densed motherboards, which in turn leads to motherboards that consist of multiple layers of etched electronic pathways to get all the electronics connected properly.
From what I understood the chip was planted on the top of the mainboard, meaning that getting it connected to all necessary pathways will be difficult, even with equipment.
In short, I have my doubts about the capabilities of such a small chip and proper connectivity to be able to the proposed breaches seems highly unlikely. Size limitations being the main problem here. I would assume that it would be easier to replace one of the standard electronic chips with an altered one and solder that back. Requires less equipment to do, can be done by lesser technical hands and will not draw (immediate) attention.