Based on using a 10.5" iPad Pro since 2017, I believe what this slide is saying is that all of these things are new to the volume priced iPad, which after all just got an upgrade to the 3 year old A10.
On my Pro, I've had most of the stuff on this slide from the beginning. Not sure about custom fonts as I've never looked into it, and I think native external storage support is new in the upcoming OS (though it was achievable with third-party apps since iOS 11).
But yeah, bottom line of this slide is that these formerly pro-only features are now in the $329 product.