As likely as this is. (not that Oxfam is exactly the scientific research org I look to for evidence. I do not have any reason to doubt)
But it seems to me the top 1% is an easy target. When the huge commercial shipping to reduce labour costs and cheap plastic packaging etc used to handle it are equal if not a much larger overall cause of deaths.
Just a much harder oner to argue for the change of, even if public opinion can actually have more effect.
The top 1% have ignored public opinion since the invention of money. Commercial cooperation may try, but hiding or greenwashing is normally the closest they get.