Interesting article. Never heard any of this before.
I am ever so slightly skeptical.
I wouldn't be surprised if this while article was a fabrication created as some social experiment to test was people will believe. "We bleed 1/3 of the blood out of HUNDREDS OF THOUSANDS of horseshoe crabs then put them back in the wild... and you have never heard about it or seen it happen."
This article just sets off my radar is a particular "April Fool's!" kind of way. Can't put my finger on it.