That’s the basic assumption for any HSR plan. You can’t mingle 160+MPH passenger trains with freight, so you need to buy a lot of land anyway. However, getting out of the urban center at 80+MPH isn’t a major issue and that let’s you avoid buying the most expensive inner city land. Getting off in the center of a city like Penn Station vs Laguardia Airport more than makes up for a few miles of slower speeds especially as these trains take a while to accelerate.