I suppose that you do not count the cost of gas when you are defining "maintenance". For the record, I would. On top of that, where is it written that Tesla has to be "cheaper" than every single other car company, EV or gas? I am sure that Tesla's plan is cheaper than some and more expensive than others. Why cherry pick one company over another. Not sure how one can simply compare the cost of these 2 plans and come to the conclusion that somehow the Mercedes is cheaper to own.
Furthermore, to take this a step further, did you actually compare the plans that you provided the links for? If I am reading them correctly after a quick glance, and perhaps I missed something as I really don't care to read the whole plan, but it seems to me that the Tesla plan is a 3 year 37,500 mile plan and a 4 year 50,000 mile plan. Where as the Mercedes is a 3 year 30,000 mile plan and a 4 year 40,000 mile plan. Assuming that to be correct, do you think that fact that you look to have left out might justify the price difference? Certainly would seem like it to me.
If you are going to make a comparison, compare apples to apples. Seems a little like trolling to me. But I am sure I am wrong.