Digital IR Receiver Module SKU DFR0094 > PI > IR-KEYTABLE > doesn't support necx protocol?

I have Digital IR Receiver Module SKU DFR0094, and have set it up with a raspberry PI

In order to receive IR, I'm using IR-KEYTABLE which reports the following:

Found /sys/class/rc/rc0/ with:
Name: gpio_ir_recv
Driver: gpio_ir_recv
Default keymap: rc-rc6-mce
Input device: /dev/input/event0
LIRC device: /dev/lirc0
Attached BPF protocols: Operation not permitted
Supported kernel protocols: lirc rc-5 rc-5-sz jvc sony nec sanyo mce_kbd rc-6 sharp xmp imon 
Enabled kernel protocols: lirc 
bus: 25, vendor/product: 0001:0001, version: 0x0100
Repeat delay = 500 ms, repeat period = 125 ms

Note in the supported kernel protocols, necx isnt present. When I tell it to switch to this protocol I get the following:

sudo ir-keytable -p necx
Protocols changed to 
Can't find necx bpf protocol in /etc/rc_keymaps/protocols or /lib/udev/rc_keymaps/protocols
 

Can anyone confirm if its a fault of IR-KEYTABLE or a limitation with the DFROBOT hardware?

Thanks