I think given that the article was a five minute read intended to introduce the financially literate reader to the new concept of quantum finance that the level of detail was quite reasonable.
To add on to the comment of /u/massinstall outlining the objectively incorrect info, finance has already been investing in quantum computing (from which quantum walks originate and are useful). JP Morgan has had a bunch of people who've put out quality work in quantum computing for options pricing. Goldman probably took heed since Nikitas Stamatopoulos is working there now? Also rumorish, but there are people at ren tec who did work in quantum information science. As to whether they use it? ¯\_(ツ)_/¯
