I think Tim’s intended meaning was more along the lines of “a language L such that when A is a more likely hypothesis than B, L’s MDL for A is shorter than its MDL for B more often than for any other language”.
I think Tim’s intended meaning was more along the lines of “a language L such that when A is a more likely hypothesis than B, L’s MDL for A is shorter than its MDL for B more often than for any other language”.