The German investigation didn't need a great deal of undermining, if we're honest. Wolters doesn't really have anything of substance against CB, that's the problem, & it could well be because the conclusions of the first investigation were correct, couldn't it.
Perhaps "undermining" is the wrong word.
Although I'm not too sure what to call deliberately feeding and publicising the wrong information in response to a police appeal for assistance in a criminal case. Particularly one focusing on a missing child.
If you wish to comfort yourself that Amaral's investigation got anything right, allow me to direct you towards the private part of the forum which specifically addresses that question.
Maybe you will be able to add something to that thread which has escaped the attention of your fellow sceptics and is perhaps among the most underused on the forum.
Sometimes even sceptics can't bring themselves to defend the indefensible.