I kind of agree with him and i'll tell you why.
I also do get your point, a 5 to 7 ft draw shot will show you how solid a stroke is and how good a person draws, but he wasn't trying to get a good draw or practicing draw shots.
All he was doing is, measuring a difference of two cue/tips with the same exact shot, so therefore he has already SET a datum for his draw shot, even if it's not a difficult shot. This means he could set two of the same shots then try two tips with same speed/stroke, then he can conclude which one draws better, simple as this.
So yes he wasn't trying to do a difficult draw, just a measurement of two of the same draw with two different tips.