Exactly, which is why they didn’t compare vaccinated vs unvaccinated.
We now have the Delta variant, which has been documented to produce much higher viral loads in everyone. That’s what they were comparing.
Do you think it’s intellectually honest to attribute the difference in viral loads to the vaccination status when the researchers explicitly say they were different variants? And we know the new variant causes much higher viral loads than the original one?
Regarding intellectual honesty, You might want to question Oxford University and the 31 researchers that submitted the report to Lancet.
They are listed.