I think Isaiah is being hyperbolic and ironic about it. We won't literally be wiped out of our memory of the previous life before the Resurrection. We would basically pay no mind to the past. Much like how some of you had a horrible past but don't make it part of your identity nor pay too much attention. That attitude will be adopted by us in the Eternal State about our current life.
“He who has an ear, let him hear what the Spirit says to the churches. To him who overcomes I will give some of the hidden manna to eat. And I will give him a white stone, and on the stone a new name written which no one knows except him who receives it. ” ’
Revelation 2:17
So when we see Christ the second time and inhabit the New Kingdom, we won't even be thinking about the horrible thinks that happened to us in the past in a worrisome way. We will see it as something insignificant compared to what we will receive. Paul contemplated something similar. The sufferings and pains in this current age will be an insignificant experience compared to what we will receive in the coming age.
We can travel to the future, but not the past. To travel to the past, we would need to go faster than the speed of light, which is impossible for all information bearing systems.
While most of my past is great, the time of when it was bad had been insignificant to what happened afterwards. I never thought about it afterwards and still don't
