I think he makes some good points, but I still see the iPad as a great complimentary device (though not necessarily a laptop replacement).
Basically everything I would normally do on my iPhone I now do on my iPad (10.5 inch Pro). I love having the huge bump in screen real estate. I have the LTE model which means I can do things like use navigation on my iPad, which is MUCH better than on the phone as it's far easier to see.
The iPad is much easier to carry around so I like to use it for music, podcasts, and things of that nature (especially with AirPods because I can just keep my iPad in my backpack and not worry about cords).
I also find certain things to be much more enjoyable on my iPad. For example reading sheet music is much easier because I can throw my iPad on the music stand and have at it, using a laptop was always a nightmare, and printed pages work alright but I'd rather save the paper plus there are some cool pedals out there that will turn pages forward/backward with the tap of a foot.
Annotating documents is far easier on the iPad, and I love apps like Scanner Pro which allows me to take a picture of a document and it will automatically convert it to PDF plus clean up the image for me, then I can go right to annotating. This is way better than trying to perform an equivalent task with a laptop. And of course drawing is much more enjoyable with the iPad over using a computer as it feels way more natural.
Of course laptops blow the iPad away in certain key areas, which is why having the best of both worlds is great.
One thing I don't understand is why he said the iPad Pro plus a pencil is not a good way to learn art. It seems like a great way to me! Not only can you draw in a natural way, you also get all the perks of the digital world (undo, copy/paste, cropping, clean erasing, layers, etc).