I am not sure about that. Even for conventional blogs, I would say that the legal situation is not really clear.
Non-legal advice often is "if it's non-commercial, you don't need an imprint", see e.g. documentation by Hetzner [0].
On the other hand, if you visit pages that do offer legal advice, the situation is suddenly way more nuanced. This page ([1], German, but you will surely be able to translate it) makes the following points and describes the situation as I remember it:
* Commercial page targeting a German market or residing in Germany: you need an imprint
* Some blog that generates 1 cent of ad revenue: you need an imprint
* Private blog which reaches a large audience and publishes on a regular basis: You need an imprint
The last one is of course not well-defined (what is a large audience, at what point do you publish regularly). And I think you can always assume that you have the "intention" of reaching a large audience, e.g. if you blog about anything that is not obviously irrelevant to the majority of people, like something technical.
So in summary, many lawyers advice you to add an imprint section even for a private blog, just to be on the safe side.
[0] https://docs.hetzner.com/general/others/impressum-faq/
[1] https://www.abmahnung.org/blog-impressum/