Longobard my understanding at least as it was presented to me in my last sim, is that all the ECAMs that follow on from the initial engine failure - hyd lo press etc - are all allowed for in the one ENG FAIL landing distance. i.e. it's not a "multiple failure".
That would be reserved for two unrelated failures, like flaps jammed simultaneously with eng fail or something like that.
Out of interest, I was trying to get someone with the March QRH updates in a question I had last month - do you have this new landing distance factor for "overweight landing"? What's your company SOP for applying it?