Flipper zero was an arduino with half a dozen sensor, radio and other communication modules. Flipper one is a laptop/mobile phone class system in weird form factor no doubt its going to be more expensive. No point even comparing them. You can't call it a price hike if it's completely different category of product. There have been plenty of openish tinkerer laptop/mobile phones projects to know that paying high end laptop price for a device with compute power of last generation raspberry pi is a likely outcome.

Not to mention you'd need REALLY large and durable pants/shorts pockets to fit a 27cm X 5cm X 20cm device that weights more than 1.5kg (yes, kilos!) compared to what the Flipper One will end up being.

We don't know the cost of the One yet. Besides, the GPD can also be used for playing AAA games, and the keyboard makes it far more useful as a general purpose PC.