Think of time travel like reloading a game save after dying to a boss. Chronologically you will have always died, you can never subtract that, but you can add the data from a previous save to the current chronology.
The fundamental data constructing reality within the game is changed to be identical, or as identical as necessary considering games often don’t save everything, to the reality within the game midst the save.
The data will always have been changed to reflect reality in the past, the data will never have been unchanged in its entire chronology. It may look like it’s the past but it’s a clever illusion intentionally placed there for immersion.
To reload a save in real life would be to enact a replica of the past, an illusion. The fabric of reality would shift to replicate the past, but the fabric will always have shifted when it did. The data’s chronology is constant.
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