You don't need G Hub running to save or switch between the Logitech G Pro X2 Superstrike's settings

If you just want to save your current settings and use those, then you're all good on that front. You just have to go into G Hub > Devices > Pro X2 Superstrike > press the Settings cog > Onboard Mode ...
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Razer Huntsman V3 Pro TKL 8K Gaming Keyboard Review - One for the Serious Gamers

The Razer Huntsman V3 Pro TKL 8K refreshes Razer's premium gaming keyboard, making it the fastest on the market with deep customization options.