Seems to be some misunderstanding of what bike bells are for here...

A bell is helpful in a situation where a pedestrian is not aware of an approaching bike. The bell informs the pedestrian of two things:

1. That there is an approaching bike.

2. Roughly were the bike is approaching from.

The hope is that the pedestrian will then behave in a predictable way to allow a safe pass by the bike. In almost all cases the pedestrian will be able to simply continue doing what they were doing before they heard the bell.

If a pedestrian can not hear bike bells, for whatever reason, that is not a problem. They can just stay consistent with the centreline of the path/road/way. They then have a responsibility to shoulder check when shifting from side to side.

Not sure I understand your criticism.

Yes, bike bells are for pedestrians to hear.

Problem: Pedestrians today wear ANC noise cancelling, thus being unable to hear approaching bikes' bells.

Skoda: We made a bell with a frequency usually not cancelled by ANC, so these pedestrians still hear it.

Sounds reasonable to me.