All you have proven is that you are not a very skilled or able
craftsman or mechanic.

You can repeat your mistaken belief that WD-40 is not a lubricant as
many times as you like, but it will not be correct.

You just don't understand what a lubricant is.

You are on the same level of expertise as someone who would claim that
motor oil is not a lubricant, because only axle grease is a lubricant.

I'd say Bzzzzt again, but I sprayed some WD-40 on it and the noise
stopped due to a sudden lack of friction.

It's a poor lubricant and shouldn't be used as such. Follow the link:

http://yarchive.net/chem/wd40.html