The point you and plenty of other people have missed is that using an EV is not driving until there is 1 mile of range remaining and then start looking for somewhere to charge. That is what people with petrol or diesel vehicles do.So they are simply a non starter.
Electric vehicles are charged wherever parked, and it's not necessary or even desirable to fully charge before driving again.
How long it takes to charge or how much is added per hour is mostly irrelevant, as no one stands next to their car waiting for it to charge.
The calculated range in the video is entirely unrealistic and has been deliberately done to show the worst possible scenarios of driving continuously for hours at high speeds with excessive loads in or attached to the vehicle. Normal driving does not average 70mph or anywhere near that.
Not surprising either that towing a massive caravan severely increases energy consumption - the exact same thing happens when towing a caravan with any vehicle regardless of it being electric, petrol, diesel or anything else.
A 100 mile journey is easily within the capabilities of almost all electric cars, the exceptions being things like the Fiat 500e or the Smart EQ which are tiny cars designed for urban use only.25 mile local shops, 50 mile youngest daughter, and 100 mile other two children.
If you meant 100 miles each way, there are plenty of rapid charge facilities in every direction from Llanfair Caereinion, considering that 100 miles from there is enough to reach almost every part of Wales, and into England to places such as Derby, Preston, Coventry or Cheltenham. That assumes that rapid charging would actually be required on those journeys - with the car in the video being driven on a real journey along real roads at realistic speeds, they would not.