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My source for this was watching the final myself. When I watched the broadcast myself it was clear to me that this was the problem. Also the (Finnish) commentators were very knowledgeable in the sport and pointed out the problem many times.

I was unable to find a clip of his throws in YouTube, but here's a Google Translated article from a Finnish newspaper: https://bit.ly/3xvZWMk.

Vetter's official performances and progressions can be found on the World Athletics (formerly IAAF) website: https://www.worldathletics.org/athletes/_/14408144

His 97.76 was in 2020 in Poland.

Thanks. Seems like a technical problem on his throw then? I'm not aware of the intricacies of surface and I assumed it was a standardized setup.

That's some high-quality journalism. Matter-of-fact, primary sources, asks illuminating questions.

In german news it was quite widely reported that he had problems with the surface of the runway

I think the throwing surface had poorer grip than standard for various reasons. So Vetter couldn't use his typical speed without slipping.