No Ember its definitely not silly.
The beneath 80 deg C was an interesting aside which becomes relevant were one to heat them slowly (cold sous vide bath coming up to temp. slowly) which might X5 the lectins and then if one goes on to sous vide them at say 90 deg C they will cook, but the lectins will not be destrotyed. One authority reckoned that 5-10 beans with these levels would be fatal.
The meat in the message is how to destroy the lectins which will produce hydrogen cyanide which is a lethal poison. Once in the body there is no way of removing it.
Sous Vide cooking these beans will not destroy the lectins.
Which is why I posted this information.