I hate that wording.
If you start farting about "assessing your running landing capability", and think you can carry out a running landing with suitable power and speed", the chances are, its going to be a messy finish!
I think it is just Ass-covering so the manufacturer can say they offered another option to an engines off landing. We practised stuck TR landings on the 365 up to about 45 kts run on and that was only with about half an inch of left pedal applied - with a complete TR fail you are probably talking 80 kts unless you have a very strong crosswind from the right (for clockwise rotors) to help you keep straight.
ISTR the Apache was a TR drive failure and it was a very fast landing.