Agreed, Magnets near signal lines is usually not a good idea unless carefully controlled to attain a particular result
The magnets are that strong. The "magnet issues" he was referring to were the connection to the plug rather than interference I'm sure.
These aren't rare earth magnets or if they are they are extremely small and weak.
I haven't noticed any issue other than the already known issue of them not being a solid connection and can easily be separated.
The thought of plugging and unplugging anything for years and years urks me a little. Plugs wear out no matter how much care you take with them. This is going to basically make the issue void.