No, I am not sure. I suppose that is most likely the case though if it's not available. I suspected the notebook was just changing speeds based on temps and feedback on the speed was unavailable. I guess it's sort of like "GO TO THIS RPM" without feedback that it's actually happening correctly.
Seems silly, but I guess that's the case. I guess the sensors of the typical LM78 are well known and if the fan speed is not reported then it's just not available.
Here's what AIDA64 reports on the sensors. It looks like it might see the "cooling devices" though there's only two fans, the PS fan doesn't exist (2nd cooling device 1). I suppose these are just default LM78 sensor probes and if it's not used then it's listed with nothing to report?