You also can't compare the effort in writing a novel, which involves a huge amount of time planning the story and narrative structure, researching, editing dialogue, multiple re-writes and more, with writing a walkthorough which just involves describing what you see as you play the game.
The difficult bit of writing isn't the physical act of typing, it's all the time spent working out what to write. There's orders of magnitude less time needed for that in these.
Yeah, JK Rowling has said that she wrote like twenty drafts of the first chapter of the first book and if you had read all twenty of them, you would basically know the entire story line. She has said the story came to her fully formed and then she spent ages trying to figure out the right way to tell it.
She used to walk her kid in a stroller until the kid fell asleep, then duck into an eatery of some sort owned by friends and write while the kid was sleeping. She would joke "When I'm famous, I will tell the world about your place!" and then did that after she actually got famous.
I think it took her like five years to get the first book written and published.
The difficult bit of writing isn't the physical act of typing, it's all the time spent working out what to write. There's orders of magnitude less time needed for that in these.