Sorry to hear this, it sounds unlucky, are the bulbs all soft with bright, white fungus? Possibly the seed was infected (though unlikely) or white rot was in the soil as it can persist several years. White rot is horrible because however well you grow a plant, if the fungus is present it will do the damage.
However I do think no dig helps, by at least not spreading fungal spores during digging. I had white rot in a few areas at Lower Farm and it never increased, even diminished. In your case, I don’t know how you can find a definitely-clean bed on your plot, somehow you need to find a bit of ground elsewhere.
