Netherite Hammer doesn't support silk touch, tried with a book on an anvil, and with a command, didn't work. Says, "item.vanilla-hammers.netherite_hammer cannot support that enchantment. I will be looking forward this fix. Thx.

Had item.getData().canSmelt(); instead of !item.getData().canSmelt(); to check whether a Hammer is compatible with Silk Touch. Oops! Fixed in 2.0.6, thanks for the report.