Depends on how you see it. It could also be that for some reason or another even with backwards time travel no one shows up. And thus you avoid having a paradox
Or it could be like a time portal so once you build one you an travel back to any point it existed in but one to a point where it doesn’t exist since you need time travel infrastructure
Here’s a link if you want to include in your comment.
It’s a site that compares car sizes. This link is for the 3 series
https://www.carsized.com/en/cars/compare/bmw-3-1997-sedan-vs-bmw-3-2018-sedan/
And here’s a dodge challenger which surprisingly is fatter but slightly shorter and higher
https://www.carsized.com/en/cars/compare/dodge-challenger-1969-coupe-vs-dodge-challenger-2015-coupe/