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We don't like to eat diseased things, I think the toads don't either, or it's not good for them.
Found a couple things saying the nematodes don't work on Spanish slugs or generally the big ones on the surface.
Some interesting thoughts here, including that any trap or pellet that contains an attractor just makes it worse. https://www.slughelp.com/natural-slug-control-effective-organic-non-violent/
hoefla-
Found a couple things saying the nematodes don't work on Spanish slugs or generally the big ones on the surface.
They seem to work on ours - we have (had) mostly big fat orange ones with the occasional leopard slug. We still have plenty in the wider garden but they don't seem to be at concentrations where they can destroy entire crops as they have in the past.
I don't think they do the toad (or anything else) any harm apart from denying them a food source, but each to their own.
MrSweary
Worrying they'll have nothing to eat? The nematodes are slug specific I think and basically dissolve them from the inside (from what I understand).