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This isn't proposing 4/10s, it's 4/8s. Basically, you're probably just faffing about for 8 hours a week anyway, so do it at home instead of at work.

Treehouse’s abandonmnent of the 4-day work week suspiciously coincided with their taking on a Series B round of funding. I’m implying they were pressured to drop it by investors. This was followed by significant layoffs.

Furthermore, no formal analysis was done of the Treehouse experience.

Nothing conclusive can be inferred from the Treehouse experience until/unless they release data and a rigid analysis is done.

I'm not surprised that didn't work, your productivity is going to fall through the day as you become tired. After 10 hours it might well be negative.