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Fill a wee bit with water and show them that its permeable.
Just because water passes through a gravel driveway doesn't mean it can be used as a large soakaway. There concern is spot on, when there is heavy rainfall it will build up. Put a french drain in and lead the water away from the house at least or to a soakaway preferably and sell it to them like its their idea.
And if you want to convince clients of the suitability of any material then redirect them to the materials manufacturer. Let them deal with them. I attach PDFs to each of my quotes for different products and installation methods to avoid this sort of problem and tell them to look it up if asked, they usually can't be bothered. People like Geogrid or the brick association are a good place to find the PDF's.
The weed membrane is permeable and it sounds like the client is confusing this with damp proof membrane which is impermeable however if the ground is clay you may still have a flooding/drainage problem as the water has no where to go,so might you be better advising the client to install an aco or land drain house end to divert any Excess water away from the property and best time is whilst you are doing the work ?