That's how it is now. The short bar in the bottom middle of the screen has been that way since I switched to gestures on my Pixel 3 and it's the same on my Pixel 4a.
What he talking about is that now if you swipe and hold to get the app switcher, there are 2 main differences (one of which he didn't talk about). He talked about how you can no longer get the app drawer by swiping a second time in the app switcher. What he didn't mention is that those 3 shortcuts, snapshot, select, and share, are replacing the shortcuts to your 5 recently used apps. Which sucks for me because I use that a lot.
But as far as the bar being there, that's been that way since I switched to gestures almost a year or so ago. Trust me, I've been using it pretty much since they allowed their use on Pixels other than the 4/4XL.
As for swiping from the middle of the screen, that's been that way for awhile, if not since they introduced gestures. It's nice as that allows more one handed use on larger devices so you don't have to reach all the way down or all the way up to open the app drawer and notification shade respectively.