What kind of source is rohtext.de?

The fact that the article cites Grok as a source for verifying data makes the website and the article questionable in my view, since Grok was specifically designed to provide answers with a particular ideological slant.

/edit: I found another source which seems a bit more reliable.... but which references rohtext.de as main source for their fact check. Make of that what you will.

https://www.mimikama.org/yandex-angriffe-afd-bots-aktivitaet-grafik-faktencheck/

In any case, a graph without sources is misleading, regardless of whether the trend actually occurred.