This is 100% pure bullshit
i would not be that hasty dismissing this. google designs its own network switches, nand controllers with fpgas, x86 motherboards. they have a decent number of people who know how to make socs/asics. it is not beyond the realm of possibility for them to design or have designed a fully custom (for them) arm soc suitable for their server farms.
as to arm for macbooks, i think you should consider whether the rumored 12 inch ipad will have an a8 or x86 in it. what is exactly the difference between a 12 inch ipad with a bundled keyboard and an macbook air ? bloomberg's timing might be early but that is the deciding factor as far as I am concerned. what cpu will the large ipad have?