All the ways for this malfunction I can think off require a list of independent things going wrong all at the same time. That being said, with the millions of miles that are racked up collectively on BMWs, one actually showing the perfect storm is not impossible.
But as said above, an independent malfunction of the TPS is not enough. Neither is a VANOS stuck open malfunction (the throttle valve would still choke the engine). I guess a stuck VANOS --AND-- a stuck throttle valve at the same time would keep the air flowing in, but you'd also need to get gas in, which means that the ECU would keep the injectors squirting with gas pedal at 0. That's a lot of things going wrong all at the same time.
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