Hi b6431
That statement is basically true and is caused by the Fast Startup process
A shutdown in Windows 8 or 10 is not really a shut down, the state of RAM is written to the hard disk and then read back into RAM when you start your system again.
Basically it is like the hibernation process in previous versions of Windows. So if there is a fault, that will be read back into RAM when your system starts again
Whereas a Restart does actually clear RAM and does not read the state of Windows. That is why in Windows 8 and 10 a restart takes a lot longer than turning off and back on your PC
Most people do not know the value of restarting (not shutting down) Windows 10 form time to time, it is actually a really healthy thing to do for a Windows 10 PC