From OPs link to the official guidelines: "If data are inaccurate to the point that no individual can be identified, then the information is not personal data.

From OPs link to the official guidelines: "If data are inaccurate to the point that no individual can be identified, then the information is not personal data. (e.g. If you refer to “the man who lives at 12 Mulberry Lane had a party last night,” when Mulberry Lane ends at number 10, that’s not personal data.). I could guess "12" was a mistake and just send spam or visit the man living at number 10. That's way more dangerous imo than an old skool email address and a first name. Yet it's apparently not considered personal data. That's why I asked, actually, since it confused me.