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.blog is supposed to be free.
[https://wordpress.com/blog/2018/11/28/announcing-free-dotblog-subdomains/])So I searched as domaine something like [xxx.tech.blog]) and it says (in french) I cannot associate to another sit
Il s’agit d’un sous-domaine WordPress.com gratuit. Vous ne pouvez pas l’associer à un autre site.
Why ?
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Because tech.blog is taken most likely
Keep in mind that the blog post your are referencing is 4 years old at this point. It wouldn’t be surprising if things have changed over the years.
But it appears that if you go to: [https://tech.blog/])
…and then click “start your [tech.blog](https://tech.blog)”, login (if you aren’t already), and enter your desired _____.tech.blog URL, you will see a free option to use that URL (if available) under the first couple paid suggestions.
Screenshot here: