As Kenny Paterson points out, on behalf of the research group, the's "the old Threema protocol" in large part because of the work they did, which makes the "old protocol" thing pretty hollow.
Also bragging in 2023 that your shiny new protocol has PFS really emphasizes that this is not a great PR strategy. Being dismissive of security research because you finally got around to implementing some cryptography principles that have been considered table stakes for a while now, especially if the research was part of what motivated your changes, is incredibly not confidence inspiring.