All batteries lose a small amount of charge when parked up, and an EV is no different. Some ancilliaries will anyway absorb power - eg: security, vehicle management, internet etc.
But it is a nonsense to suggest that an owner after a two week stay in an airport carpark will come back to a "dead" car. Normal car batteries remain charged for months unless aged and close to being defective.
If Tesla have invented and fitted batteries which go flat after a few weeks this is a likely commercial embarrasment.
Just more anti-EV rumour mongering!
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