Even WWF doesn't think avoiding palm oil is a good solution. Not short term and definitely not long term
https://wwf.panda.org/discover/our_focus/food_practice/sustainable_production/palm_oil/
Palm is the most efficient crop for producing a wide range of fats. Replacing it with some other source of fat will require more land and water, and disrupt nature in another part of the world.
I think it's fair to say those brands will source from the cheapest, scummiest places and it doesn't matter what "certificate" sticker is on the box.
But it is so hard to avoid them where I live :/ Even the fairtrade, vegan and ~~responsible~~ green washed products are from those 3...