It hasn't been long that someone applied a basic, cosine similarity to HN comments to find alternate accounts. It worked quite well afaik https://news.ycombinator.com/item?id=33755016
If you're worried about being identified from alt-accounts you're much more likely to be tracked via reuse of emails or some other information that you have slipped (see multitude of cases)
Simple text is not PII, laws are not interpreted like technical discussions are https://xkcd.com/1494/
