SInce it's a 2018 build, you'll get 2018 hardware in the car that 2020's don't come with. They were mentioned above:
- Homelink module installed (and since it's an LR, will have Homelink software included)
- Dimming side mirrors
- Leather steering wheel
- All charging adapters
The VIN is late enough (13xxxx) that you will NOT have the items some of the early models had like the harder seats, the older glass roof coating, stiffer suspension, etc.
What you do need to keep in mind and check carefully is that it also sounds like the software and option package will be packaged like a 2020:
- Pay-per-use supercharging (if this car had been sold in 2018, it could have had lifetime free supercharging)
- Pay monthly for premium connectivity after the 1st year, which includes real-time traffic, TuneIn, etc. (If sold in 2018, this would have been free for lifetime).
- Standard AP, or you might add FSD at the $8K price. (If sold in 2018, would have had no AP, EAP for $4K, or FSD for $7K).
One further item to keep in mind that cannot be changed is that the battery has 2 years of time on it, even though it has almost no cycles on it. Normally the battery warranty is 8 years or 120,000 miles, but at your 8-year ownership point, the battery will be 10 years old. I do not know exactly how the additional 2 years will affect the battery retention that far out, but it's something to keep in mind. If the car was indeed a showroom car, then it was kept in a climate-controlled area and temperature aging effects on the battery should be minimal.
Assuming the car is sold as "New" in the legal sense and you have full warranty that applies from the date of purchase, then I think it's a great deal.
This is a good list (and an informative post) but as I think was mentioned already a couple of those things you mention didnt come on 2018s later in the year.
For example, my vin on my 2018 Model 3P is also 130,XXX. Manufacturer date on my car is November 7th 2018. My car did not come with "premium connectivity for life". I am fairly sure that promotion ended at the end of third quarter 2018. The "free supercharging for life" promo also ended somewhere around 3rd quarter 2018.
My own late 2018 Model 3P has been very reliable, although I have been to service a decent number of times. All my trips to service have been either to get rims and tires replaced (as I have mentioned before, I have had horrible luck with rims and tires on this car, so have bought a total of 4 tires and 3 rims since I have owned it), or getting things that were supposed to come with my car, but didnt (4 attempts to get a spoiler that would stay on the car properly), or, HW 3 upgrade that I paid for.
No real issue with the car. I think late 2018 is fine. I just would still wonder how things like "the wheels getting scuffed" would happen on a car with 21 miles.
OP, there is a lot of speculation here about "why the car could be there". Did you ask tesla for the service history, and if the car will be sold as NEW or USED on all registration paperwork?