This is because there's a government price cap on home electricity, but not on commercial electricity - and rapid chargers are all commercial (and of course for-profit).
It is if you use a rapid charger. If you're fortunate enough to be able to do what you need with a car within 50 miles or so of your house and leave it overnight to charge, it's cheaper.
Very few people would use 100% rapid charging. Even on a long journey, they can arrive home with, say, 5-10% remaining, and recharge at home. (The car calculates this automatically.)
That's... weird? Maybe it's blocked in your country? The link opens just fine for me.
Those were tested numbers, not advertised though. I don't see how you'd get a drop from 200 to 120 miles, that's a 40% drop. Maybe in a gasoline powered car, but EVs can regeneratively break, so I don't think it'd make that much of a difference.
Reading some more, there are a handful of different ratings. the old European one: NEDC, the new European one: WLTP, the US EPA, and China's CLTC.
Generally the ratings from lowest to highest go EPA, WLTP, NEDC, then CLTC. The EPA rating is just a tad high I've read when you look at fast highway driving (e.g., 75 MPH), but should be within ballpark range.
I think you're under estimating the range of modern EVs.
EV at rapid/ultra-rapid chargers: 25p/mile
Petrol, diesel: 15p/mile
EV charging at home: 8p/mile
This is because there's a government price cap on home electricity, but not on commercial electricity - and rapid chargers are all commercial (and of course for-profit).
[1] https://www.rac.co.uk/drive/electric-cars/charging/electric-...