[lagilogi]

> the man, known only by his case number,

In other words, this is inaccurate and a clickbait. I would not have expected that from the Guardian.

[infogulch]

The data released includes your age range, gender, and places you've been to. Which was already enough for the press to fully de-anonymize some individuals and confront them on camera. Seems like a reasonable title to me.