Seems like the best passthrough was a fairly easy goal to achieve since nobody else was even really trying. Heck, the Quest applies quality degrading filters to passthrough video (add noise, remove chroma) to discourage using it.
They probably mean the quest 3 which has RGB cams unlike the prior quests 1 and 2. I also disagree it would have been artificially muddled to discourage usage. If that were the case they'd not have presented it so proudly. It's just the kind of cam setup that $500 buys (in fact it probably is a bit subsidised)