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They are coming through from the soil. Presumably the artificial grass came from a factory, not much chance of leather jackets there! Unless it was second-hand.
Birds will eat them - blackbirds and starlings love them.
One thing's certain, the adults won't lay any more eggs in your lawn so this is the last time you'll be bothered with them.
Surely that can't be right? If the leather jackets can come up through the membrane then so can everything else - weeds, slugs etc? Doesn't that lead you to think maybe they put the membrane in upside down, or that it isn't good enough to keep the weeds out for long?