I haven't read this yet, but I can't imagine what ARM would say that I'm not already expecting from a company selling a proprietary product to say about an open source competitor. I think the fact that ARM even thought they should "address this", say quite a lot about RISC-V.
It's written by their marketing department. Basically, they say open architecture poses the risk of fragmentation and designing instruction sets is expensive, so it makes sense for everyone to pay them to do it.
