The low demand is the more likely scenario
Using older data from 2020 shows how the want for Suzuki models is relatively recent
As you can see, Suzuki had about 157 votes total for the inclusion of any cars from the brand
That’s a good bit away from the top spots, being beaten by brands like Land Rover, Bentley and Hyundai (then just ramping up their sportscar offensive)
And also, if any Suzuki model is likely to appear in Forza, it’d be the most recent Swift at the time, amassing a total of 56 votes at the time.