You are right that they were not stripped of the style, but they no longer use them, nor do they receive money from the sovereign fund.

Effectively, they are no longer HRH and the style is not being given to their children automatically as it would have been.

The fact that they could take it back does not change how the title is being used.

Also, your comment doubled, may want to remove the second one if you can. (Medium loves to do that).