Looks like it’s based on Cargo Collective’s Montessori template and using their tools.

They’ve modified it some to use some more concepts from brutalism, but it looks like all the main functionality would be there if you wanted to do the same.

Does CSS have display delays?

You could do it by writing Javascript with timers and a list of display times and positions, using CSS position:absolute and display:none being switched to display:block for each item when you want it to display…