As mentioned above there are a few factors. If you’re on a street adopted by the local authority then it’s not down to you to pay for the power used, street lighting is typically an unmetered supply.
Some confusion may occur if the terminology is not understood.
The cable from your supplier comes into a cutout. This is where the “looping” takes place. Whether the street lamp comes from the top or the bottom of the cutout only changes whether it not it shares your fuse. This is the fuse that may need upgrading for the EV charger.
It’s possible what the electrician has said was misunderstood it’s also possible they were wrong. I don’t like to be disparaging about others but I’ve seen it a few times where the incoming supply has been misunderstood
Now, it’s not strictly the case that the charger can’t be fitted on a looped service, just that the demand needs to be controlled until the delooping and fuse upgrade.
A photo of your supply including the cutout and meter would allow people to advise further