According to https://cateee.net/lkddb/web-lkddb/ASUS_WMI.html CONFIG_ASUS_WMI=m depends on CONFIG_HOTPLUG_PCI=y which you are not defining so the option is removed (unset) when the defconfig is saved.
The patch below resulted in it being built:
diff --git a/projects/Generic/linux/linux.x86_64.conf b/projects/Generic/linux/linux.x86_64.conf
index 7307fb40f2..f703fc3145 100644
--- a/projects/Generic/linux/linux.x86_64.conf
+++ b/projects/Generic/linux/linux.x86_64.conf
@@ -1679,6 +1679,7 @@ CONFIG_GENERIC_PCI_IOMAP=y
CONFIG_PCI=y
CONFIG_PCI_DOMAINS=y
CONFIG_PCIEPORTBUS=y
+# CONFIG_HOTPLUG_PCI_PCIE is not set
CONFIG_PCIEAER=y
# CONFIG_PCIEAER_INJECT is not set
# CONFIG_PCIE_ECRC is not set
@@ -1709,7 +1710,11 @@ CONFIG_PCIE_BUS_DEFAULT=y
# CONFIG_PCIE_BUS_PEER2PEER is not set
CONFIG_VGA_ARB=y
CONFIG_VGA_ARB_MAX_GPUS=16
-# CONFIG_HOTPLUG_PCI is not set
+CONFIG_HOTPLUG_PCI=y
+# CONFIG_HOTPLUG_PCI_ACPI is not set
+# CONFIG_HOTPLUG_PCI_CPCI is not set
+# CONFIG_HOTPLUG_PCI_OCTEONEP is not set
+# CONFIG_HOTPLUG_PCI_SHPC is not set
#
# PCI controller drivers
@@ -3663,7 +3668,7 @@ CONFIG_SENSORS_W83627EHF=y
#
# CONFIG_SENSORS_ACPI_POWER is not set
CONFIG_SENSORS_ATK0110=m
-# CONFIG_SENSORS_ASUS_WMI is not set
+CONFIG_SENSORS_ASUS_WMI=m
# CONFIG_SENSORS_ASUS_EC is not set
# CONFIG_SENSORS_HP_WMI is not set
CONFIG_THERMAL=y
@@ -5550,7 +5555,7 @@ CONFIG_HID_A4TECH=y
# CONFIG_HID_ACRUX is not set
CONFIG_HID_APPLE=y
CONFIG_HID_APPLEIR=m
-CONFIG_HID_ASUS=y
+CONFIG_HID_ASUS=m
CONFIG_HID_AUREAL=y
CONFIG_HID_BELKIN=y
# CONFIG_HID_BETOP_FF is not set
@@ -6286,7 +6291,11 @@ CONFIG_WMI_BMOF=y
# CONFIG_APPLE_GMUX is not set
# CONFIG_ASUS_LAPTOP is not set
# CONFIG_ASUS_WIRELESS is not set
+CONFIG_ASUS_WMI=m
+CONFIG_ASUS_NB_WMI=m
# CONFIG_ASUS_TF103C_DOCK is not set
+# CONFIG_EEEPC_LAPTOP is not set
+# CONFIG_EEEPC_WMI is not set
# CONFIG_X86_PLATFORM_DRIVERS_DELL is not set
# CONFIG_AMILO_RFKILL is not set
# CONFIG_FUJITSU_LAPTOP is not set
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You probably don't need these:
CONFIG_SENSORS_ASUS_EC=m
CONFIG_ASUS_LAPTOP=m
CONFIG_ASUS_WIRELESS=m