Just got an email from Tesla (I am an owner of a May 2020 MYLR, VIN 60XX, without previously installed all-weather protection kit):
The promo code does not currently work, but given it's a $90 value, hopefully it does soon - pretty cool goodwill gesture for those of us in the northern US that ordered before this became standard.
Order your complimentary Model Y All-Weather Protection Kit by entering your exclusive promo code at checkout: [redacted].
With easy self-installation, the All-Weather Protection Kit can reduce the risk of paint damage from stone chips in areas where heavy salt, sand or gravel is used to improve winter road conditions. Learn more about maximizing your range and maintaining your Model Y in cold weather with our winter driving tips.
The promo code does not currently work, but given it's a $90 value, hopefully it does soon - pretty cool goodwill gesture for those of us in the northern US that ordered before this became standard.