Ah no. A salad was anything combined with anything else but not cooked (again). This led to some true abominations at the table. Too often, mayonnaise (and not even mayonnaise but Miracle Whip) served as the binder.
My wife's grandma makes "pretzel salad", which is crushed pretzel sticks that are tossed with a mixture of margarine and cream cheese, I think, then baked until crispy then crumbled.
In the meantime, cream cheese, maybe whipped cream?, sugar, a few other onesies and twosies, and canned shredded pineapple are mixed into an unholy slop.
Then, when is time to serve, the crumbles are mixed in with the slop and there you go. Salad.
Mmm, interesting. Pretzel salad for me is the layer of crushed pretzel and melted butter (no cream cheese here) baked, like you said, then a layer of a cream cheese frosting, then a layer of strawberries in strawberry jello. All separate layers, no unholy slop, and it's sooooo good. But no, it's not salad.
It used to mean any meal served cold. Later versions were encased in gelatin for better preservation, which contributed to the later post-war jelly salad recipes.