Sounds like the perfect recipe for severe dehydration and electrolyte balance, which can cause serious consequences.
Scroll down to see the potential effects of this one bowl prep kits:
https://www.drugs.com/pro/suprep-bowel-prep.html
I had a colonoscopy a few years ago. Last thing I felt like doing afterwards was exercising, if only because I was so tired from getting little uninterrupted sleep the night before.
Definitely one of the most ludicrous ideas I have ever read on BF.