They are called pseudo-metrics because they relate the concept space and the code space, with a clear understanding that the concept space cannot be formalized strictly enough for a real metric to be defined.
Zove se pseudo-metrika jer povezuje koncept prostora i prostor koda, sa jasnim razumevanjem da koncept prostora ne može da se striktno formalizuje dovoljno da bi se definisao u stvarnoj metrici.