I’m guessing they found a partner with a bunch of Picos they were looking to get rid of for cheap, since no one is interested in buying them anymore. 
It’s a strange choice to showcase their device. But the same could be said about the onboard PSRAM which doesn’t easily work with any modules either. I guess that might have been good for marketing materials, since maybe it encouraged some buyers who would have otherwise been on the fence. They might still be able to use the PSRAM for something, but probably not as intended. It also sounds like some of the pinout choices were a bit odd too, with conflicts on some of the included hardware like the keyboard. I think that’s what might have been going on here, though ultimately, in another thread, it sounded like a hardware patch was required to get it working correctly.