The Playdate looks like what you'd make if someone only described the games kids made and shared on the TI-83 graphing calculator and then asked you to build a device.
It fits, in my head, very much in that same toy niche as Teenage Engineering's Pocket Operator series of music making devices: https://teenage.engineering/products/po
He's wrong. There are some great games that I've played on it. And I'm a Millennial dad. AND I think Panic is a cool company that's worth supporting, AND I think that, if you have the money sitting around, it's probably good to support weird niche hardware projects by indies.