Moreover - since Nadya is my "primary" pseudonym, I deliberately make it easy for people to find me across social platforms: https://nadyanay.me/identities
Based on this list you can assume I am Nyu, Nadya, NadyaNayme, or Yuno in a number of places. Three of those names are common and so are commonly already taken by the time I create an account somewhere - so it isn't an exact science. For example - the account "yuno" also exists on HN but isn't me. If it were I'd have capitalized the "Y" and this account wouldn't exist.
As far as I have been made aware - nobody has ever identified any of my other personas as belonging to me.
But if they expanded their dataset to other sites like reddit I would be concerned.