I just Googled the exact phrase "Why 1 nostril is always clogged up when breathing and it seems to switch now and then", and the first result was an explanation from a major medical center about it (https://health.clevelandclinic.org/why-do-i-sometimes-get-st...). Perhaps there's other questions search engines don't do well on - but why don't you consider the AI answer to be "anecdotal silliness" in the same way as you would if it were just some guy on Reddit spouting off?