The deprecated Scroll API didn't allow scrolling backward. Now that it is being replaced, is there a way to do that with PIT?
Scroll API is not deprecated. You can use PIT with
search_after to retrieve a previous page.
Maybe I'm using the wrong term, but the docs say we should not longer use the Scroll API. Or does it just mean we should only not use it for deep pagination, but there are no plans to deprecate it?
Yes, we discourage using scroll for deep pagination.