I don't think personal/formal (tu/vous) forms of addressing count as avoidance speech, and neither does the normal switching between casual and formal registers

I don't think personal/formal (tu/vous) forms of addressing count as avoidance speech, and neither does the normal switching between casual and formal registers depending on who is addressed, because so many languages make that distinction, whereas according to the article, avoidance speech is a rare phenomenon. Even Japanese, which has an exceedingly complex system of reflecting social hierarchy in speech, doesn't seem to count has having it. Rather, the defining feature seems to be that avoidance speech reflects an actual and specific social taboo rather than a simple difference in status.