I can’t see this “news” reported anywhere else

Clearly not trying very hard:

https://www.bbc.com/news/live/world-68642036 (8:40, “Russian TV airs fake video blaming Ukraine for Moscow attack”)

https://www.motherjones.com/politics/2024/03/deepfake-video-terror-moscow-putin-ukraine-claims/

https://www.tf1info.fr/international/entre-les-speculations-de-simonyan-les-commentaires-de-soloviev-et-le-deepfake-sur-les-antennes-russes-comment-les-relais-pro-russes-alimentent-la-piste-ukrainienne-apres-la-fusillade-pres-de-moscou-2290401.html

https://www.cdt.ch/news/mondo/attentato-al-crocus-city-hall-la-tv-russa-incolpa-kiev-ma-con-un-filmato-fake-346781

and The Sun is notorious for making stuff up

And this article cites — with direct link — a BBC reporter’s X post. Well, who is actually “making stuff up” here…

Yet, BBC Verify journalist Shayan Sardarizadeh stated that an AI-generated audio was dubbed over a mismatch of two recent Ukrainian TV interviews.

Exposing the sham, he wrote on X: "The deepfake video has in fact been created as a composite of two recent interviews published in the last few days with Danilov and Ukraine’s military intelligence chief Kyrylo Budanov.