That would be a good feature especially for low light conditions since the shutter will be slower to open due to a set aperture.
In the case of the photo, multiple photos were taken so in one photo where a person was, the next shot may have had the person further along and the detail behind where the person was in the first shot is known. And so it went for dozens of people walking around and dozens of shots taken.
Same process was done for this photo; people were walking in the courtyard and by the trees; places they were not supposed to be.
If they incorporate features such as this, this phone might just get me interested. Even though I have primarily dropped out of the photo world, barely touching my Nikons on trips, I very seldom take any photos with my 4XL, but possible if the photos were better, I might take more. Might carry the phone more places too.
These are the photos I take with the phone; just a shot to send to friends via email, and you can see that it is lacking sharpness that would have been if taken with a DSLR or possibly a better phone.
Or the occasional shot through a windshield with no worries about oncoming traffic or pedestrians.