This is likely a completely fabricated story by a marketing guy, who used gullible ZDF journalists for free exposure. He refers to himself as "Internet-Profiler" but is "Director Digital Strategy Consulting" of a digital marketing company called "cyberpromote". He has no credentials in Forensics and the company normally provides search engine optimization.
The BND, Germanys exterior intelligence, has voiced skepticism towards the claims and method used by the self proclaimed "expert". The BND could reproduce similiar "search queries" for other nations too, because google does not give the exact results, but rather related results. Also no other expert was asked about this by the ZDF journalists. They solely rely on the single claims of a single person, who likely uses this as free marketing.
Deepl:
However, security authorities doubt the informative value of the search: the results of the trend analysis do not refer to the number of searches actually carried out in a selected region and at a selected time, but to random samples and the probabilities calculated from them. ‘The exact terms entered are not necessarily analysed, but also word stems or even just individual words in the query,’ said the BND spokesperson.
Trend analyses with search volumes that are too small result in so-called artefacts due to the algorithms, which are not designed for this type of use. ‘The supposed correlation with these artefacts and a reference to Russia can also be reproduced for numerous other countries, which makes an attribution to Russia appear less plausible,’ it said.
In addition, anonymising VPN use is not reliably taken into account by Google Trends. ‘Search queries therefore allow only limited or no conclusions to be drawn about the actual location of the user,’ said the BND spokesperson, referring to the suspected Russian connection.
Translated with DeepL.com (free version)
I strongly recommend not to rush into a conspiracy theory that was most likely sawn by a person with financial interest. We already saw where this leads to during the COVID pandemic.