Ultimately, people (especially journalists) don’t understand the subtle but important different between ‘does not stop transmission’ and ‘there is no evidence that it stops transmission’
Likewise, ‘Pfizer jab won’t work with more than a three week gap’ and ‘no evidence to show Pfizer will work with more than a three week gap’
I’m no scientist but something being ‘true’ in the realm of science is saying ‘it has good data to back this assertion that has been peer reviewed’
And conversely, if it doesn’t, then ‘it hasn’t been proven’
But something not proven is not the same as something being false.
Sorry if I’m rambling 