I know most people that were on reddit at the time are fully aware of this and won’t be surprised but don’t dismiss the findings out of hand. It’s important that studies are being conducted and the fact that the finding match our lived experience is still noteworthy.
While it certainly is a bit of a captain obvious moment that exposure to far-right echo chambers helped radicalise vulnerable people into the far-right, but I can see the merit in having empirical evidence supporting what we see (as OP said) - it is a lot easier to dismiss an andecdote than statistical evidence