The essence of no-dig is to avoid digging the soil which disturbs the soil, brings new weed seeds to the surface and disturbs the established micro-climate of soil-dwelling creatures. If you have enough compost or are willing to invest in sufficient manure, mushroom compost and/or other organic material to cover the soil with a thickish organic mulch, this is ideal. But an inorganic mulch still meets the three objectives above. If there are sufficient benefits of the no-dig approach to outweigh the extra risks of encouraging slugs and snails, then it is clearly an advantage over using more traditional methods. In terms of labour-saving, there is a great advantage, since a light-excluding inorganic mulch will kill weeds underneath. I do not think a rational adherent of the no-dig approach could find much with which to disagree in this approach.