What a banal comparison? "Coz jets r fast n bikes r too" MCN what are you doing copying BBC/Daily Fail style journalism? The advice in the article is surely just for car users pulling out of road junctions.
A jet fighter pilot is only focussed on a very narrow field of view directly infront of him at those kind of speeds. Yes a pilot can look to the sides, but his options for moving away from straight ahead and very fast are virtually nil. There isnt much you can fly into up there you know.
I use observation ALL the time by turning my head to physically look. I do not rely on peripheral vision for road manouvers. Using peripheral vision will get you killed. I constantly scan all around me even when there is no other traffic visible.
When you get more experienced on the road you can try moving your head slightly when looking straight ahead so your eyes give your brain more data by just sligthly changing your eyes view. There are times on the road when you need to move forward/accelerate to get yourself into a position where you can be seen by other road users. Slowing down can sometimes have the reverse effect when cars assume you have slowed down to let them pull out.
The most important part is to train yourself to look !!
I agree with one thing in the article, that car drivers arent expecting to see a bike at road junctions, because they don't look for bikes. Positively ancient bike safety principle.
As for being seen? We can ride round with headlights on main beam, wearing dayglow safety suits and a Christmas tree with flashing lights stuck on our eads and car drivers still will not see us. Car drivers not looking for bikes was and still is the problem.