This *seems* new, because I've never heard a Gates comment on the matter. In that Xbox book with the original saga, iirc, it was mostly Nintendo execs talking about it, with possibly no comment from the Microsoft side (presumably because it was a failed bid on Microsoft's part). We need some clarification on this...when did Gates make this comment?
The reference to Yamauchi doesn't necessarily imply that his comments were from pre-Xbox days, or refer to pre-Xbox days - Yamauchi is still one of the biggest shareholders in the company, and moreover, still holds massive influence within the company. If he objected to any takeover, I'm sure it would generate some qualms amongst the current Nintendo management, and other big shareholders. His approval is effectively necessary, even if not technically necessary (i would think).