To be fair, the GPD brand has been around for years so it's not like they saw the SteamDeck release and tried to profit on it. They've been THE brand that has been trying to push the portable gaming pc paradigm for a decade, until Valve just "made it right" (price, performances and usability).
It doesn't speak of the quality of the products nor the viability of their specific solutions, just a reminder they're not a "random" brand.
I adored the game and also spent a little over 120h in it, but it's commonly accepted that past the capital, the game kind of lose its pacing and starts iterating on the same ideas, just in different settings.