I'm not saying the report does, just that there is a logical argument that solely in terms of transmission masks could be as effective.
Only stupid people would take that sentence as being anti-vax (so, anti-vaxxers), because I'm solely talking about spreading the disease, not the effects of it. The effects would be much, much worse with mask wearing because there would be not protection in the body to stop the disease having a devastating effect. A vaccine does which is why it's far more preferable to just wearing a mask and will save a lot more lives.
Let's say you did an experiment of two crowded rooms with the same amount of Covid present in each environment. One room is full of vaccinated people not wearing masks, the other is full of unvaccinated people wearing masks. You may well find that a similar amount of people contract the virus in each room, but I'd definitely hypothesise that there'd be more serious illness and death from the room of unvaccinated masked people.