Generally speaking, owing to the higher growth rates and shorter intended lifespans, Broilers are fed on a substantially higher protein, higher energy (that is, higher fat - mostly) diet with higher methionine and lysine requirements than layers. I'd have to check sources, but I think they are higher threonine as well - but if you get the first two right, and your raw protein % is 20+ instead of bare 16, its likely you hit that number incidentally.
As to the rest? I think they made a typo. Here's (admittedly, small sample size)
Earthworm Meal from feedipedia.com
Dried, its about 90% dry matter - that's pretty typical of all dry ingredients - moisture content at or below 10%
of that dry matter, 14.9% ash - consistent with the numbers above. 57.9% protein, again, in the range of the numbers above. Crude Fiber, 2.4% - almost exactly the number above. Fat (Ether Extract) 9%. NOT the 0.9% reported above.
/edit even so, if you can produce or obtain earthworms of the right type, in the needed quantity, it would be superior to BSFL in major respects. But that's a LOT Of worms. Earthworms are around 75% moisture so 100g of live earthworms is only about 28g once dried. My flock (without my pasture) needs about 16# per day of commercial feed, which is most of 7.25kg. If 10% of that were earthworm meal, I'd need 725g of dried earthworms per day - which is 2.5kg of (live weight) earthworms daily to be dried and ground.
This study says 8 earthworms per 43g (dry weight) of soil is the best stocking density. If the average earthworm is 2.5g, I need 1,000 per day live weight, in soil which (dry) weighs about 11# - which I would completelyt denude of earthworms. Multiply that by their reproductive rate, and I'd know how much soil I'd need to keep for growing earthworms in. Sources say they need up to 90 days to reach sexual maturity, then produce an egg weekly...
That's a decent amount of dirt.
and I only have about 80 birds.
(Someone chekc my math please)