It says that the legal basis for the investigation is article 171 ter of the Italian Copyright Law, which lists a lot of things that boil down to selling what you have no right to sell. https://www.wipo.int/wipolex/en/text/477668 The one part that is different is "c) promotes and organizes the unlawful activities under paragraph 1" which might also apply to a reviewer who does not directly sell things. But it's not just "promotes or organizes" either, so I think they'd want indications of quite substantial involvement before launching an investigation.
Do you have another source for that? I don’t see it in the article. It says the exact charges aren’t known due to the way their legal system works.