Did you see what that looks like in the pic, why would you eat something that looks so disgusting? Obviously, I only mean if you can stand to look at it without noticing the olives first.
Lots of delicious things look disgusting. It took a very brave, or very hungry, man to eat the first oyster.
Creamed tuna is fine. It's a meh dish, it's edible without being interesting. I'm not sure that adding olives, whose primary flavour is brine, to a fish dish is particularly out there.
With all the hideous aspic recipes from the 50s it seems weird that you'd pick out a pretty normal dish as being especially awful.