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I'm not certain, but I suspect it is similar to this.

But from the description in the article, add a platform, the bowed head is extended off the platform and down lower.

Yes, there is not even 1 single image or video try to explain this, its weird, author should post more details.

I don't know about the method in the paper but if you suffer from this, try doing glute bridges.

Yeah, that would be nice, can't understand gibberish he/she explains, I think it is some sort of doggystyle with head bowed down?