Is it right to say that Erlang and Prolog are actually that close as stated at the beginning of the article ? As far as I am aware Erlang does not run the unif

Is it right to say that Erlang and Prolog are actually that close as stated at the beginning of the article ? As far as I am aware Erlang does not run the unification algorithm and it is very different, you can, for instance, assign variables. I don't think it is right to compare the two as close languages as it is claimed but I would be interested in your opinion