Really? My weekend 13 year old car has an original engine and done 105,000K and runs lovely. Has this guy has never seen traffic before in his life and worry about a head wind really?There a good few user guide.
But essentially after 50K miles the factory warranty is gone, but the battery/motor will still be under warranty for 8 year and unlimited miles.
The key difference in cars is introduction of 'Dual motor' cars and original 'Autopilot' in 2015, and than 'Autopilot' 2.0+ hardware in cars made late 2016. If you want the 'Full self driving' stuff Tesla is doing you will need a car with Autopilot 2.0+ hardware - 8 cameras around the car versus.
Tesla Model S Buyers Guide covering everything you need to know.tesla-info.com
The 'new' £90k+ Model S is actually underneath very similar to the original 2012 cars and even today one with 170K miles on the battery offers virtually the same range as a brand new EV from many other makes!
Tesla is also now offering battery replacement packs for older cars out of warranty, they aren't cheap at present, but will essentially give an old Model S near 300 miles range at 70mph, more than most other brand New EVs onsale today - 300miles of range at 70mph isn't cheap to get brand new either.
If you aren't bothered about 'Full self driving' a cheap (£30K) Model S will last you a long time yet, but still offer the potential in future to be upgrade with more range officially from Tesla.
Get an AP2.0+ car its essentially future proofed even for 'Full self driving' more than any other brand new car you buy today, though clearly you will have to still pay for the software it the original owner hasn't specced it - Currently nearly £10k!!!
Personally I think you could find match better videos as this one rings alarm bells all over IMHO.
It suggests to me that don't keep the car out of the Tesla motor/battery warranty and if you want one safer to get a newer on under PCP/lease.