if I buy this, can I assume that wolf have made the holes from the bolts thick enough to just use standard chairing bolts for DA cranks as they don't seem to sell chainring bolts specifically for them?
Unlikely, you'll probably need single ring specific bolts. That said, SRAM, include spacers with their single rings to allow you to use standard chain ring bolts.
if I buy this, can I assume that wolf have made the holes from the bolts thick enough to just use standard chairing bolts for DA cranks as they don't seem to sell chainring bolts specifically for them?
https://www.sigmasport.co.uk/item/Wolf-Tooth-Components/110-BCD-Asymmetric-4-Bolt-Chainring-for-Shimano-Cranks/FUU1