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They are solid walls, the gypsum is from a separate job and needs to go to the tip.
Ah so the under render looks like lime? Can I therefore leave the lime touching ground level and just remove the cement? Maybe all the cement.
Unsure on what expert yet but not doing it myself.
I couldn’t find anything about slate parginv either so a bit of a mystery.. next door also have it too (different style of building too)
apc
NotThamesWater
What sort of walls are they - Cavity or solid?
The slate suggests solid, with a slate DPC (I'm very far from an expert though - I'm not aware of slate parging being a thing either), and a lime render, which has then been covered in a cement render.
This means that the lime render now acts as a wick for ground water, which helpfully also breaches the DPC.
Safest bet? Go back to brick and start again. Any render needs to stop above the DPC, and it's probably worth putting in a French drain along the wall to reduce ground water and splash back.
If it's solid wall, take that gypsum to the tip and use lime-based plaster / mortar / render.
What sort provenance does the expert have?
They may have buried dead kittens and puppies too, in that case.