Re: What data
"I have had both jabs , so either I am now relatively safe or the jabs don't work... Which is it ?"
The former. They just aren't making people come back to the office. Those who want to can. And there is the end of the matter. Your current safety is as strong as it ever was.
As for their data, it likely consists of existing public case, hospitalization, death, and variant rates. They don't want to go to the effort of getting everyone settled into the office again only to have to shut things down a month later, so they decided to do nothing for a while. They don't have to do this out of an altruistic concern for their workers' safety, because their profit depends on their workers' safety too.