You have made a great point. A major point.
Firstly, if implemented, it affects the ranking of a (e.g.) pseudo-science website. It shouldn't hopefully cut it out.
Let's keep real though:
$10,000 network cables for hi fi systems? That's pseudo science.
Any website that mentions 'Turanean' is now pseudo science -even though at one point in time it was an academically acceptable term.
There are a million+ monkey wrenches.
If I write a blog on Atlantean or review a book written by a pseudo-scolar, how does my ranking change? Will it eventually fall off the end and we'll be denied (as far as Google is concerned), fair ranking?
Also, what about free speech? How do "Women against Feminism" rank as it can be argued that it is not politically correct? How does an algorithm cater for all the nuances? What about Stormfront or any site that attacks political correctness?
What if the atheists take control? Where else can I find treatise on Fire Temples and Zoroastrianism?
Someone wrote once "From little bird turds do big ones grow." and I think that is the wedge here. Once you do that, you start losing access to information. And it is sooo easy to drive that wedge harder.
From that we can ask the question if Google has the right to be the world guide in ethics, morality, philosophy and cosmology. About a year or so ago, I have started using different search engines with improved results. Having another language helps too.