I was skeptical, but the article starts with Train Dreams, which according to HowLongToRead, would take 2 hours at 300 WPM.
https://howlongtoread.com/books/323872/Train-Dreams
Two days per book full time means one every 16 hours. Enough to read the full Foundation Trilogy with one hour to rest between books.
On a side note, I'm ashamed to share that I tested my reading speed, and while it was 264 WPM, my reading comprehension was 50%. That's why I read slower, and frequently re-read.
https://swiftread.com/reading-speed-test
Out of spite I tried to measure my Spanish reading, 520 WPM and 100% comprehension. Very unfair since it's my native language and I can glance and skip instead of reading every word.
Can't say I ever took a test like that. 644wpm and 100% in English (native language).
Hard to judge that based on just five questions though.
I'm curious what these tests are measuring if you say your reading comprehension is only 50%. Your comment here is completely articulate and sensible so you are obviously fluent in English.
Edited to add: hm. I just got 67%. I guess my college degree is a waste. Should have gone the humanities route instead.
2000 WPM @ 75%
ESL and I got 512 WPM and 75%. I don't agree with the 1 wrong answer but I digress.
Reading fast means you can take in more info per unit of time. It can be a useful ability, if tedious at times.