Did he do the reverse test and set the two arrows up to shoot the same momentum? If he didn' t, he neither proved nor disproved anything.

How many times did he repeat the experiment? Did he get identical penetration ONCE and call it good or do the experiment 100 times?

How much weight difference was there between the two arrows? Enough to make a significant difference in momentum or was the difference as insignificant as the difference in penetration he found? (I saw one test like this where the difference was a whopping 50 grains. Whoopee.) Was the heavier arrow the same size, brand, model and finish of the lighter arrow? Was it weighted to make it heavier and, if so, how was it weighted to avoid screwing up FOC and spine? Did he use the same size, weight and configuration point on both arrows?

Did he shoot the arrow from identical bows of different draw weights or did he adjust the poundage on the same bow to get equal KE? Was the bow specifically tuned to shoot the heavier arrow or did he just fling it without doing any tuning at all?

Was the foam he used certified as completely uniform in consistency - or did he go down to Hobby Lobby and buy the cheapest old lumpy stuff they had on hand?

That' s always the problem with these magazine tests. They leave too many unanswered questions (that too many people don' t know to ask), don' t account for anywhere near enough variables, and then make grandiose suppositions and conclusions with little or no verifiable and repeatable supporting data. But the undeducated accept it as Holy Gospel and repeat it to all their friends, then those friends repeat it to all THEIR friends, so another myth is created. Or, in this case, reinforced.