Unfortunately for cars they count deliveries not cash.The original Electrek article said Tesla wanted to get people who had already ordered to pay for and take delivery of their car before the end of 2020.
Now that's given me an idea. If TeslaUK call me and ask me to pay for my order before Christmas - I will ask for free supercharging in return.
Guessing this doesn't apply to people who have only just collectedI've just been told they are, I'm collecting mine next week and got the deal! Thanks to OP for this, I mentioned it on email and asked to be included. Apparently UK have asked for the same deal as US.
Doesn’t really cost Tesla much, but depending on your usage it could be significant. Some people seem to exclusively supercharge, for whatever reason.