Edit: I got downvoted. Is a powered vacuum pump not possible in this application? (Like putting a vacuum cleaner nozzle against the wall, possibly using a more powerful motor than usual, for more suction.) I think it's a fair question but maybe I'm way off base here.
Presumably you were downvoted because your question suggests that you haven't actually read the article, which does mention how it compares to other powered suction (i.e. "vacuum pump") devices.