several posts ago you noted it was held up because people weren't being infected. So which is it...either it's immunity with data so they can prove it works, or they can't prove it works because people aren't being infected. You don't need Human Challenge trials if you can prove immunity already.
It's both...
The delay was because people weren't getting infected. Because only 0.014% of the population is in the trial, and only about 0.01-0.02% of the population gets Covid-19 each day. The chances of the people in the trial getting infected is very, very small.
So after a long delay waiting for enough people to get infected, they open up the results and see one of the reasons it's been slow is that half the people in the trial couldn't get Covid-19 because the vaccine works.