As someone who cycles ~30 miles a day across the capital to get to and from work I'd say, at best, if he's not a regular cyclist, he'll need to be pretty savvy and have some fast learning skills if he wants to make the deliveroo thing long term.
Or be lucky.
But, like Oscar's Dad, I see your lad's attitude as one which is commendable.
In the interests of reducing the risks, some 1on1 urban cycling tuition probably wouldn't go amiss - but I understand that may take him beyond the realms of his budget.
Some local councils offer Bikeability cycling tuition for free, I don't know if yours does.