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True - the anaerobic 'sludge' is not good to toss into new anaerobic water - depending on the amount tossed in - and the volume of the new waterIMHO, It wasn't the water that was the issue as we barely transferred over 25% of the old water. It was the under sand sludge which again likely was not a measuring cup worth.
The same phenomenon has been seen time and time again by pulling sand out and reusing it without washing first. The organics quickly degrade and become toxic.
A lot of people have gotten away with it. A lot have gotten burned by it. Why that works, I have no idea.