How to change your past question

I’m watching the video “How to change your past overview”. Brooke says that our past doesn’t affect us now. But we thought thoughts in the past which shaped our brain (for example a taxi driver has developed areas in his brain to think more spacially). So what I think now is the heritage of my past? I can of course change it now but my body does not renew every second. Does it make sense? Thank you!