I also have an undeletable variable (“Variable”), as mentioned here. First I thought it was a kind of default variable, but recently I noticed that it isn’t there on another Mac.
@peternlewis said “They should be gone from 8.0.2” but I am not sure if he referred to the duplicate instance of the variable or to the fact that it was undeletable.
With the current KM version the duplicate has gone but the “Variable” variable is still undeletable.