Actually, I agree. If I do the dressing the day before, with the poached egg yolks,
I refrigerate it and keep it cold. I only toss it at serving time. If it's a buffet I would toss the salad it in batches, keeping the rest chilled, not just for safety but so it doesn't wilt.
If I use a raw egg yolk as in the recipe, it's only right before serving, and the salad is eaten right away.