Yes, that's right. Intel has been an ARM licensee since StrongARM (Xscale) and acquired other ARM licenses with acquisitions such as Zarlink, so it has some expertise with the AMBA technology. And there is no risk of ARM being able to use that as a business lever - you could argue that AMBA is so pervasive in SoC it should be licensed on fair and resonable (FRAND) terms, but if you use it to get an advantage over Intel, then what's to stop that happening to TI, or Samsung, or any other licensee. To keep its business model intact ARM has to be scrupulously fair with its licensing.
No confusion - that is the block diagram of the X1000 from the Intel datasheeet released on Friday - ARM devices don't use a bridge, that's an Intel architectural feature. The point is that it looks more like a chip based on the ARM core than previous devices, uses the AMBA bus and is nominally aimed at IoT...... there you go. It can't get as low cost or low power as chips based on the M0+ ore, so it will have to have a multicore version if it is to compete in that middle ground or it will die - how Intel will do that is a very interesting architectural question.