It may sounds weird, but a traditonal Chinese herbal method can greatly decrease the side effects of any brain related cancer/tumor, or even cured it, happened on many patients.
If the article author saw this, you can reach at me, I will tell u the whole method and details, for free, for sure.
I'd bet one has to figure out the neurology, college level mathmatics, and computer science theories before dive into how these neural networks work and all the nitty gritties.
This is a known Google soft penalty in order to contain spam contents and domains, but unfortunately, this thing penalized a lot of good, clean, and legit blogs, and when you caught this penalty, in 99% cases, you will never recovered.
It will only shows 1,2,3,4,5,6,7,8,9,11, or simialr numbers when you site:yourdomain on Google.
I found this thing around 2019, and it still exists till today.
A way to identify this: first post more than 20-30 articles on your blog, and if after several months, it still shows only several pages when you site: your domain, then it mostly caught this thing.