I'm not sure about the Star Adventurer GTi, but for my EQ6-R, NINA indeed sees the driver. And it sounds like yours does too, otherwise how are you slewing to your target? NINA will only send the command to your mount if it first connects to your ASCOM driver, be it EQMod, GSS, or whatever is used for the SA GTi.
Can you post a NINA Log? I am on the NINA discord and can ask for some assistance if you want (or you can join too!)
Logs are found here:
%LOCALAPPDATA%\NINA\Logs\
https://nighttime-imaging.eu/docs/ma...oting/general/
In general, if there's an issue with a driver error, it's usually the driver at fault, or some combination of software isn't working right. NINA is just the middleman for various drivers at one level.