It’s not talking about an unchanging clock. It’s saying that change depends on something that runs like a clock, that “ticks”, that alternates sequentially and

It’s not talking about an unchanging clock. It’s saying that change depends on something that runs like a clock, that “ticks”, that alternates sequentially and in cycles An alternative analogy would be: imagine space and time as opposites of a spectrum. If you had just 1 moment in time, with no alternation, no change, then it would be akin to having all the space together at once, nothing moving. In the other extreme, if you had as many moments in time as possible, it would be non-stop change, in a seemingly infinite space that could never be fully explored, “unknowably large”. In a way they are saying that the universe is a sort of superposition of these extremes, and there isn’t any physical difference between them. At least in the models and experiments