Yes, I get no holly. Bit odd. I tried a different web browser on the same iPad and we have holly. Was using Safari to begin with. Perhaps it’s a caching thing - if the http cacheability lifetime on the images is nice and long, which it should be, then that would work.
A website I built for my wife had images’ cache lifetimes set to something like a month, so I would have had to reduce that dramatically well before I needed to make a change and then swap the image out and go back to the long lifetime again afterwards. Or more likely rename the image to xxx_v2 or whatever. But I made a point of making all the cacheability lifetimes enormous because it reduced load and traffic costs and made the site feel incredibly snappy for users on dialup.