I'm not normally one to defend councils but this is just a stupid tabloid garbage story. They're 72-reg, so couldn't have been bought before 1st September 2022. So at the very most they're all of 4 months old.
The council have stated that there is an issue with the supply cables, which seems like a reasonable excuse and the sort of thing you often don't find out about until you start digging, as the records are often wrong. There are 14 of them, so to charge them all is going to need a pretty hefty supply.
If the council had delayed ordering them until the chargers had been installed there'd probably be an equivalent whiney article about all these unused chargers that the stupid council installed a couple of weeks ago that they don't have vans for.
There's still an ongoing supply shortage for all vans and cars, mainly due to the chip shortage. Ordering ahead was probably a sensible plan, if you ordered now then you may have a long wait. Besides, they have a custom built load area that would have been made to order.