The translation is accurate. "Bei Level-2-Fahrzeugen bleibt die Fahrerin oder der Fahrer grundsätzlich immer in der Verantwortung." can be translated this way. The only nit I would pick is about the translation of "grundsaetzlich" by "as a matter of principle", it could also be read to mean "generally", "usually", "always" or "basically". In this case, they probably wanted to say "always", but there would also be the legalistic meaning of "grundsaetzlich" which is "normally, but with exceptions".
All in all, no matter the above nits, they are obviously trying to shift blame away from their vehicle.
All in all, no matter the above nits, they are obviously trying to shift blame away from their vehicle.