It is really funny when West is discovering magic of cheap aluminum for wires, while former Eastern Block is ripping aluminum wires from walls because it is no.1 reason for fires.
Where aluminum causes fires is due to the fact that it expands and contracts more than copper does, and it can oxidize and corrode when not properly cared for (for example, when dissimilar metals are used, or when exposed aluminum wire ends are not properly coated).
We can assume that someone at Tesla is familiar with the properties of aluminum and can insure that they are using the right connectors to mitigate these issues. (or at least, we can hope)
Aluminum was used for a short time in the west for household wiring and was quickly outlawed.