They don’t have a memory problem, but we are certainly paying for it. 8GB is fine for the vast majority of users, the problem is for those that need (very few) and those that want (some) to upgrade their ram, it’s stupidly expensive to do it. But again, Apple also knows their user base very well, and most of them can likely foot the bill without abandoning Apple.
These are just rumors for now from people who heard that was the reason but no one is on the record. It’s also worth noting his show had terrible ratings: It’s worth noting the show had completely shit ratings: https://www.thewrap.com/the-problem-with-jon-stewart-ratings-apple-plus/