The fact that NYT didn't post this story says more about their bias than the legitimacy of the story itself. You know full well they would post a story with this level of verifiability if it was damaging for Trump.
As far as I know, literally nothing about the story has been verified.
For all you know the Post validated the content itself as real.
Think about how well it works for a scenario like this. Using real videos to legitimize fake emails is an easy win, especially if you don't release either. No on can disprove the legitimacy of the emails and if Biden says they're total BS you release the real videos to add more legitimacy and give the whole thing another news cycle. Then you claim victory and go silent.