AxeItem enchantments won't modify even though swordItem does (TieredItem)

I'm using mixins to modify enchantments. In this case, its the sharpness enchantment.

I would like sharpness to not be applicable to the sword and axe by injecting canEnchant

here is my code:

    @Inject(at = @At("HEAD"), method = "canEnchant", cancellable = true)
    private void Sharpness(ItemStack itemToEnchant, CallbackInfoReturnable<Boolean> info) {
        if (itemToEnchant.getItem() instanceof TieredItem) {
            Enchantment e = (Enchantment) ((Object)this);
            if (e instanceof DamageEnchantment) {
                info.setReturnValue(false);
            }
        }
    }

This code works flawlessly for any type of sword, but axes refuse to get changed, even when changing TieredItem to AxeItem.

I would love to know a fix to this.