But their parent wasn't (in fact, they mentioned x86 and AMD, which are integrated circuits).
Look at a random PC (or, until recently, a random laptop): it's made from a lot of individual components that can be swapped out or upgraded independently. Storage, RAM, CPU, GPU, cooling, motherboard, WiFi chip, Bluetooth chip, speakers, microphone, screen, all the peripherals - they're all designed to work together as a category, and to be easily replaceable. I can source each one from a different vendor, and they'll still work. Hell, in many cases, you can even fix individual components, with a hot air station and a steady hand. And if I upgrade a component, my old one can often get a second life inside another computer, possibly someone else's.
It's a good thing to have, and there's nothing stopping modern laptops, tablets and phones to have the same level of upgradeability and swapability. Nothing - except that the vendors don't want to[0]. These things run on the same set of hardware standards as larger computers, and on literally the same software stacks. I[1] should be entirely able to open up my phone, desolder its battery and memory, swap them out for newer and better ones, apply sealant, close the case and have the whole thing work. There's no technical obstacle here - the only problem are the business strategies of the vendors.
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[0] - I have another long rant for the usual "it's customers who chose integrated over repairable" argument, and I'll post it elsewhere in this thread. For now, I'll just say: it's not like anybody is asking customers to choose. These options are not being made available in the first place.
[1] - Or my friend who spent half his life tinkering with electronics. Or the repair shop down the street. A point commonly missed in discussions about Right to Repair (and Free Software) is that it isn't about expecting consumers to do hardware/software work themselves - it's about making it possible for local markets for software and hardware maintenance and repair to exist.