How do you know they are YLR? I respectfully disagree. They certainly wouldn't put expensive wheels on the Performance vehicles if they were just going to be used for testing and apparently all test vehicles must be destroyed. Or they may use YLRs for testing.
Tesla customarily produces the more expensive model first to maximize their profit at the earliest opportunity. Look at the Model S. You can get a PLAID in a few weeks and have to wait until Aug for an LR Model S.
The configurator says Model YPs have an EDD in March, while the YLRs are not available until August.
Why are test cars destroyed?
Automakers typically destroy test models because they may be drastically different from the vehicles approved by regulators and certified for sale to consumers