the init 6 applies to rc1 64 bit?
It applies to both 32 bit and 64 bit.
The point is that the KDE libraries have been updated and so there is a good chance the "shutdown" widget will not function correctly (until the system is rebooted).
So the instruction is given to reboot the system using command line.
Which command you use is entirely up to you

Terry
In dodgy cases I open Konsole, do
su and do
poweroff and 30 seconds later physically switch on.
On many occasions when the PC Menu > Leave > Shut down or the shutdown widget did not work, this method worked always.
My laptop does not always reboot cleanly from PCLinuxOS compared to Windows. At times when I reboot from PCLinuxOS, I see that I end up in the BIOS and some other times there is kernel panic during shutdown after a warm reboot.
I have not yet updated to 4.10.1 and will report back if anything untoward is seen. Thanks for the update.