I don’t get this, since when was Gramma Muttar? Was there some general assembly, ???? ????? ??????, that I missed? And what kind of randomness game is this anyhow? You slid the switch to get it to turn on and it will. Who cares when? Random would help if you aren’t trying to turn it on and it might not turn on at all. That would be classic Ein Mis’chaven.
Personally, I take issue with considering an electronic delay as a Gramma. Is it really not ???? ??????
The Zilzul Shabbos aspect is self evident. To most people it will look no different than a regular switch that just happens to include a ‘Halachic twist.’ In fact, it makes more a Zilzul Hatorah in general, for that matter.