The cosmic rays from black holes consist of particles with energies of 10E18 – 10E20 eV. The flux density on earth is no more than 1-2 particles per square km per year. This is totally different from the cosmic rays originating from Super Novae with energies around 10E9 eV and flux densities of thousands of particles per square km per year. The Nature article from your link is behind a paywall and I do not believe articles from Nature are worth paying for. SInce you say the article claims or indicates that cosmic rays originate from black holes I feel quite strengthened in my opinion of Nature. Svensmark has nothing to fear from that publication.
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