Always amazed how different people are able to see or read the same thing and come to completely different conclusions. Here's what caught my eye:
Of course, this is almost impossible to measure statically. Once you put a resistive load on and a certain amount of power the fuse is going to go up to it’s temperature and stay there and the resistance is not going to change very quickly, so you never know that the fuse is distorting. It only distorts getting up there and then going back down. It doesn’t necessarily distort by the time you’re ready to make the measurements. That’s one of our problems with static measurements. You just don’t know everything that you need to know.
Something I have been saying for a very long time now: measurement ain't all that!
Also this one passage, the lower half of page 6 that OP thought was so good, all it talks about is resistance.
It's also a really, really simplistic view. After all, he himself says
The resistance invariably rises as the temperature goes up --that’s pretty much the laws of physics
Something you learn in entry level classes, by the way.
So put it all together, what have we got? The man himself saying it should be obvious there's a lot more going on than we can measure.
Well if we can't measure- and no less an authority than John Curl just told us we can't- then what are we left with? Our ears. Listen.
When we do that it very quickly becomes perfectly obvious there are vast differences between fuses, and even between the same fuse used one direction vs another.
Go and listen. You will see.