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So, he seems to be saying that the strength is only reduced by 20% and not by 40%? Makes more sense to me, and I'm glad to read that, if I'm interpreting what he wrote correctly.

Of course, he...

Here's a chart for determining just how much load hammockers put on lines. I forget where I stole this from. Sorry. And keep in mind, this is static weight. True real-life weight is dynamic.
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I am kinda shocked that the sling decreases the strength of the rope by 40%! I realize knots can cut strength by up to 80% (rule of thumb is 50%), but thought a whoopie sling would do so much better...