If he wants an airline job then he really should consider CTC or Oxford. They have all the airline links these days. The modular route is not dead but if you want the best chance of a job then modular is sadly no longer a sensible choice. CTC and Oxford are expensive and they have changed the market, but if an airline job is the aim then you are best, in my opinion, playing their game.
The NPPL would be a good starter, at least for a few lessons if not the whole license, in order to discover how much your nephew really likes flying.