I remember reading about that in the 1970’s. They positioned the razor edge-up. The ions supposedly flow down and sharpen it edge-first. Be careful- the ions might make it so sharp it’ll go through the atoms in your skin, making you radioactive!
I like having an Edge Pro Apex to use when doing FFG blades (and when I’m in the mood to use it). Also, I do think the Work Sharp Ken Onion with the Blade Grinding Attachment has saved my sanity. Sometimes people will ask me to sharpen really bad knives. The WE 100’s barely touch those. I use the WSKO-BGA to rough them in and switch to the Wicked Edge to finish. I can produce excellent results in reasonable time.