Regrettably, there's no need to check whether Nero's calling that API because the fact that the machine goes to sleep means it's not. While a process which called that API (the right way) remains running, the OS does not go to sleep.
Never versions of Nero might do it right, but unless you can find something to that effect in the documentation I wouldn't be tempted to spend money on a gamble that an upgrade would help.
If you like, I'll write a wrapper for you so that instead of starting Nero directly you start the wrapper and it in turn starts Nero. Of course, you shouldn't trust me, and the compiled wrapper binary should first be subjected to a battery of anti-virus tests at your end. I'm only semi-joking
It's sleep time for me presently but I'll have a play with that wrapper when I get a chance and post it back here.