As I see it:
* Their point before was "Higher TH is better than lower TH."
* Their point this time is "Defense decreases damage taken."

I think those really might be cherrypicked single values. If they had been interested in giving us accurate game mechanics information in either case they wouldn't have had to do any experiments at all. They have the code, so they should be able to look at it and tell us the exact relationship between TH and drop rate, defense and damage taken, etc. Instead they do "experiments" with poorly defined methods.

For all we know, he is hand parsing this and has an N of 1 at each defense value. Like, pull a level 114 monster. It hits him once, he uses Defender. It hits him again, he uses BCB. It hits him again, he GM-kills it or lets it kill him.

I agree that it wouldn't be hard to test, though. You would need some way to keep your VIT/defense constant and survive something for a moderate period of time.