Zapper Experts - Why 30khz ?

Hello, I have spent quite some time now reading Hulda's book and researching all these zapper devices.

Can somebody please explain why zappers operate at 30khz frequency spectrum when in her book Hulda clearly states that most pathogens range from the 300khz to 500khz range.

Yes I realise this is the frequency she designed, but technically it makes absolutely no sense to zap 90% of pathogens which live in 300-500khz with a 30khz zapper.

I find this illogical. Will some technical electronics expert elease explain this to me ?

Furthermore, why are some zappers also targeting 2.5khz and 15hz when there are barely any pathogens listed in that frequency range?

Here is the diagram from the book.



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