Not the full story
I was behind someone buying one of these knives in the Duty Free at Geneva airport two weeks ago. She asked the cashier whether it was OK. The cashier asked what airline she was on. The customer replied that she was flying Iberia to Madrid. The cashier said that this was no problem. From this I deduce that the instructions to the cashiers depend on the airline or the destination. The old rule used to be 4"/10cm blades max, and I suspect that this is now the current rule again, in most cases. (I suspect there was no formal change ever made to the "international rules".)
Have to look at whether the same knives are on sale in other airports...
Swiss itself has returned to using steel knives with meals. I don't see the issue with this, as the plastic knives we get on other airlines can still cut meat, of whatever variety.
Momo