sorry for late reply.
I didn't say it was a "copy" of ReiToolbox, but said it's using the exact same method than Reitoolbox :
bpcShutdownSystem();
bpcExit();
they both do the exact same thing, so they both have the exact same issue with autoRCM.
im using sx pro with autorcm installed I don't think their autorcm is working correctly if I shut down from their bootloader section it will reboot back into rcm after about 10 secs didn't relize till the switch was dead again when I took it out the carrying case
nothing shutdown the console except bootloaders.
bootloaders are either the official one from nintendo, or launched from RCM (the payload sent with your dongle).
when you choose shutdown, the console reboots (it doesn't shutdown) and wait for a bootloader to shutdown the console.
if you don't have AutoRCM, then it's not waiting for you to provide a bootloader and just launches the official nintendo's bootloader which will shutdown the console.
if you have AutoRCM, then it's waiting for you to provide a bootloader (SXOS dongle, or any other payload). If you don't provide a bootloader then the RCM drains the battery because the console is still powered.
if you shutdown from the bootloader option (hekate, sxos bootloader menu), then it should do it.
you are saying the bootloader's shutdown menu is not working? if you keep the SX dongle plugged it return to the bootloader over and over?
maybe there's a bug in the SXOS version you are using and it always send the reboots command instead of shutdown?
note that if you plug the console to any power source AFTER shutdown, it'll boot into AutoRCM. if you want to charge your console while being shutdown, you need to plug it before selecting shutdown option.