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I would agree with you but the genie is out of the bottle already. Nigh everyone can and could have reproduced these results, especially that archive.org and similar things exist.

So, I don’t think it causes any new harm, if anything it gives you future risk aversion.

This is nothing new, e.g:

Analyzing stylistic similarity amongst authors

https://news.ycombinator.com/item?id=10050603

http://markallenthornton.com/blog/stylistic-similarity/

37 points by lingben on Aug 12, 2015

This is not complex and is a well known method that state actors have been using for quite a long time. Governments have FAR more advanced ways to track you than this, but it's good for people to realize it exists.