My EV does cost a bit more to insure than my diesel car, but then its worth a lot more, so (and I can only speak for myself, which of course is only an anecdote and not data) but it looks about right based on the value of the vehicle to me anyway.
As for batteries, there was a lot of worry about this in the early days, none of which has really come to pass ... 2nd hand EV market is (or was last I looked) very buoyant, cars are holding their value (although its helped by new EVs being very long on lead times) ... after 4 years and 53,000 miles my batteries seem as good as they were on the day bought them ... I think most manufacturers are doing 8-10 years plus warranty on batteries now (which is already up from where they were comfortable with in the past).
However I don't think its entirely fair ... the older an ICE car gets (IME anyway) the more work it can need ... more and more bits need replacing ... yeah if you keep servicing and look after it you may well not have to replace your engine but you can need to spend out good chunks of cash on it as it ages ... EV service costs are minimal, so many fewer parts to go wrong.