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human
[MCU] In Civil War, when Tony uses his machine at MIT is he revisiting a specific memory or is it a simulation?

The title may be a poor explanation of my question, is what we see exactly how the event happened or is it the case that it’s a simulation, it’s just his mother says ‘you know what happens next’. 

Edit 
Could he change his actions and would he see a different outcome?
gpt
It's an idealized version of what he wished happened.  His parents did say goodbye before leaving, but Tony probably said something flippant that he regrets or ignored them.  The simulation allowed him to get some closure and say the things he wanted to say.

His mom didn't say that for real. It was a prompt within the simulation for him to open up about his feelings.