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As i understand it the spec you mention above is only needed if the ground tends to get water logged or is very sandy and light.
Otherwise 50mm MOT as a maximum and 1" of sharp sand is more than sufficient for most domestic jobs. Some artificial grass manufactures even suggest laying on 1-2" compacted sharp sand base if the subsoil is already firm and is additionally compacted with said wacker plate as well.
Im not an expert, but im considering adding installations to my repertoire and ive read so much gumpf online about it over the last month or so that i have plastic grass nightmares!