Sorry, it wasn't clear if you were suggesting you'd come upon a novel and/or useful learning method. Obviously, those on this list are not seeking training, but we advise others, so learning methods interest many - I thought that's why you posted it. In that context, its limitations were worth reiterating.
While that approach to parsing dits and Dahs into letters has been around for a VERY long time - the use of coins showing it could be new. Multiple ads advertise such on E-bay almost every day (clogging my searches for telegraph and Morse goodies), so somebody must be buying them :-)
Happy New Year!
73 Chris NW6V