After looking into this, I don't think Sony stores any actuation (or shutter) count for this model. Apparently only "some DSLR models" support this such as A200, A230, A290, A300, A330, A350, A380, A390, A700, A850 and A900 (this is according to Exiftool's Sony webpage). I cannot find any such value using Exiftool for this model.
And upon examining our code, we don't even parse the maker notes for Sony cameras because there are so many different variations!
So I'm afraid this never actually worked on your RX100ii. You might try using {frame4} instead (the last four digits of the filename when ingesting). Should be sufficient for your limited use of the camera perhaps.
--dennis