No, it just means they are not hiding from their comments -— bad or good. Most of us like to dress up a bit in public instead of going out in hoodie and shorts. It would be incredibly silly to expect anyone to list all their warts and failings on their bio, but incognito and anonymous suggests . . .
Like the new ad:
https://www.thedrum.com/news/2023/04/11/ad-the-day-25m-campaign-sees-father-confront-his-son-s-antisemitism
I find it usually suggests merely a desire for privacy. I never look at a bio unless a poster points one out. I generally find the ones who puff to be conceited.
It suggest nothing in particular. BTW, why is it that you log onto this forum with a pseudo name?