Waterlogged, you did read my conclusion, yes?

I explicitly stated that the results depend on airflow and the fan's pressure. In fact, demonstrating this was the whole point of the second half of the test.

The fans are not "of the poorest quality", they are simply very good silent fans (and silent doesn't mean quiet, it means silent). Such silent fans are used by many people in Liquid cooling setups since for many, the main benefit of liquid cooling is reduced noise.