We don't know if AIDA has read the whole book, we certainly don't see her finish it nor is their dialogue to that effect...
...even your source is clear on that.
We have no idea if she read the whole book or just some of it, but SHE knows way more than she needed to bring people back.
Certainly, she could download what she has but there's no indication that she could translate it into something understandable by humans....she sees binary code.
Secondly, even if he managed to get the book, he wouldn't understand it anyway, so why the struggle?
Yes, he would. The book is a mystical object.
The Darkhold wants to be understood and makes itself readable.
This is how it looks to AIDA
...and this is how it looks to humans
There's dialogue in S4 Episode 5 that the readers of the book see it as written in their native language.
"I didn't think it would be in German."
"No I'm reading English. Wait, are you not seeing what I'm seeing?"