I'm considering replacing my manual Gazelle Esprit belt drive bike with a similar e-bike at around the £2000 mark. I am considering the Tenways CGO800S; one positive review states:
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I can fix punctures on my current belt driven bike, but it seems that the motor connector position rules out DIY repairs. How is that to be solved 15 miles from home? Is this a problem common to electric bikes?

The "solution" is to get the best thorn-proof tires and tubes. This won't eliminate the problem, but will make it very unlikely (unless you ride in parts of the country where cactus spikes (or equivalent) are ubiquitous). Tenways has brick and mortar stores. I'd ask them what is required, but am not an adherent of belt drives.

Doesn't seem hard, if you carry the tools, own a leather jacket and those cool gloves, It's got the standard motor connector used on many hub motor bikes,

Well, thanks for that! From that video, it looks even simpler than on my present bike. The review was misleading - if that video is correct.

It is not easy to remove the rear wheel, especially if the drive motor is part of the assembly, from the frame of an ebike in a shop, on a stand. In the 'wild' even more difficult.
This is because of a variety of factors including the weight of the bike and wheel, connector cable from the wheel to control panel, proper positioning of the axle guides on the wheel, you also generally have to use a larger than 'normal' wrench for the oversized nuts, etc.
I've worked on some 'cheap' ebikes that don't have a connector for the electric cable making it even more difficult.
As has been said using thorn 'resistant' tires and tubes offers some relief from general punctures but nothing is fool proof. You can also try tire liners, they have proven to be pretty good at preventing typical punctures.

Agree armored tires will help, how much depends on what the local cut and puncture hazards are.

Better still would be armored tubless tires but these rims may not be tubless-compatible.

My Alfine belt bike (not electric) rear is easy to remove and finicky to replace. My ebike is mid drive and flat fixing is the same as any bike with normal drivetrain. With that combo I can't comment on the rear-drive ebike flat fix process, but it's worth investigating before purchase.

If I planned on traveling any distance with my e-bike, g-bike or motorized bicycle I would want to be able to fix a flat on the road. Flats are going to happen.

I was carrying my full patch kit on a bike trail in Michigan when I heard the tire go thumpety thump. I had worn a hole in the sidewall, but it was still rideable back to the car. We found a bike shop and bought a new tire.

In fact, I bought two new tires after asking the shop to suggest tires that were easy to mount/dismount. So much easier if you can break them loose without tire irons.

Two solutions:
1. carry a split tube: https://gaadi.de/en/. You cut the punctured tube with a knife and remove and insert and pump up one of these, no wheel removal. Do a proper fix when you get home.
2. Marathon PLUS Schwalbe tire and fill with kevlar flat out. My rear tire has been this way for 2 years, zero probs, while i have replaced my front two trike tubes multiple times (easy). the rear hub motor on my recumbent trike makes
repairing on the road a royal pain. I actually do both - carry a gaadi tube, marathon plus tire and kevlar flat out.