This is an obviously AI-generated site. There is no interest on correctness, just "engagement".
Because there's a danger now that any writing (human or otherwise) can be labeled LLM-produced. So we need accurate heuristics, or none at all.
Now, look at the number of books on each language. Does it sound reasonable that a no-name startup with no contact details (except an email to an aktivlang.com domain that redirects to storica.club) will invest in a serious effort to human-translate and adapt that many books to language learners, without anyone noticing?
I'm not going to argue about the writing style because we know it is an arms race. But look at the underlying business, that business would not exist without AI generated content.
>AI-powered feedback
>Storica uses artificial intelligence (OpenAI) to provide feedback on your writing. Your written content is sent to OpenAI's API to generate corrections and suggestions. We do not use your writing content to train AI models. Your writing is processed solely to provide you with immediate feedback.
It does look LLM-generated though.