Comments still have not ELI5 the block universe concept that Einstein was referring to. That is because it can be complicated and would take a lot of time to write up and describe. Instead here is a video that ELI5 the concept very well:
Does the Past Still Exist? by Sabine Hossenfelder
Description:
Albert Einstein taught us that space and time belong together to a common entity: space-time. This means that time becomes a dimension, similar to space, and has profound consequences for the nature of time. Most importantly it leads to what has been called the block universe, a universe in which all moments of time exist the same way together. The future, the present, and the past are the same, it is just our perception that suggests otherwise.
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