It is correct. I was careful with my choice of words. Please take them at face value and don't read into them something not there or what you want. For example, I never suggested anything close to "military grade Jamming" which - for the record, I am personally very familiar with having spent 24 years as a military radio communications equipment technician (as noted via the link in my sig) supporting a vast array of real-world and exercise events involving jamming and jamming countermeasures, here and abroad.
And please note what I wrote that you quoted. I said it is "highly unlikely" a motherboard in one computer would affect the entire network. That is absolutely true. But "highly unlikely" is not the same as "absolutely impossible" and the exact reason for my next sentence in that post.
True. But while 802.11n is not exactly new, it was and still is great at isolating channels and connections compared to previous revisions. I would suspect the OP has at least 11n. But again, more information is needed.