Even being very very friendly and interpreting your comment in the way you clarified it, there is an assumption in your comment. The assumption is that Tesla will be able to bring their car to Level 5, full autonomy, while GM will not be able to that. And let me ask you why you say so? Just because Tesla, in a marketing move, tells you they will be able to do that, and GM is not doing that? Maybe GM has a legal department that warned them not to do that?
To paraphrase your point, no there's no difference between a car that, according to their marketing "will maybe be able to go to mars" and a car that "has the hardware that could be maybe able to go to mars, but we prefer to tell you now because we could be liable if we fail". I understand the value of aspirational statements, but still...