Ah, he set the temp to 29, that's quite high and if the ambient temp was close then the ac does not need to come on.
I did not get the impression that this ac is doing a better job or not as there is no frame of reference at all. Compressor not running the ac isn't really a test of how efficient it is.
When i was doing power calcs years ago here, inverters were a no go as there was no way to estimate power unless you could measure them directly when running.
All i can tell from inverters is they do a better job at maintaining a constant temp, how efficient is debatable, but man is there is so much market speak around them claiming so.