It's total BS isn't it.My personal opinion is that EU (and probably UK) have toooooo many regulations for such a simple thing - towing. There are no special mechanics or car systems that are needed to tow. It should be just a function of the vehicle mass.
The insurance company don't care about that - they pay even when you do the things wrong. So this should be not the case. There is no special paragraph in my contract.
Maybe Hyundai could try to void the warranty BUT should prove that the towing is the reason! How they can prove that? So I can put 4 bikes on the roof BUT I'm not allowed to tow 1,300 kg caravan. From my previous experience I can prove that 4 bikes on the roof with 130 km/h is even more resistant than towing 1,300 kg caravan with 90 km/h. Believe me!
And how they will know that I ever towed something? I intend to use my towbar just for bicycle carrier. Just having a towbar does not mean that you ever towed anything.
The only problem is the police - they will definitely fine you if you don't have numbers against O.1 and O.2 and you tow. That's for sure!
This guy covers in details the case in Australia: Towing a caravan with an electric car - can it be done?
This one is very good, too: Tow Story: Hauling a camper trailer with an electric Kona
I like the approach in Australia. Unfortunately don't think that EU will ever have such simple regulation. You can check it in the first link above in paragraph 3. Is it legal to do so?