Only to a certain point. Too thin, and the joint starts to weaken.
Can you squeeze all the glue out of a joint?
The example you cite uses hard maple. Even then not much of a difference. Try his method on a different wood and you should see different results. For example red oak and white oak glue up differently. (Note his failure differences sort of show some influence by the actual piece of wood.)
What he does show is that the glue has to penetrate the surface to develop full strength.
What he does show is that the glue has to penetrate the surface to develop full strength.
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I don't know why there would be a big difference between types of wood - you seem to believe that there is for some reason - but I remain unconvinced of the benefits of squeezing out all the glue. Therefore I will continue to not worry about how much of a gap remains in my glue joints. 🙂