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Yesterday, I contacted the admin and wrote a lengthy message in my usual style.
Surprisingly, the person turned out to be quite reasonable. He even makes mods himself (which might be why he understands that it's not just a simple task). The admin said he's willing to cooperate in every way, publishing links and mentioning the authors, etc. The only two things are: first, he says he can no longer fix the old news articles that have already been published; and second, he says that sometimes it's difficult for him to find the authors, but I offered to help him with that if needed.
Overall, I think the situation is more positive than negative.
I also suggested that he publish a guide on how to add a model. He said it was a great idea and that he would upload it in the evening.