Comments of chapter undefined of I Receive Directions To Become The Supreme Demon In My Sister's Novel

I don't understand -

This doesn't match the synopsis

I've SOLVED it!!!! Yes, SOLVED it I've solved the mystery to why the plot is so different from the synopsis. Firstly, the mc wrote the book, died and was transmigrated, however, his devastated omnipotent 'younger sister' decided to edit the contents of the book, and claim the book as hers, which explains the changed summary. To started off, she revived the mc in the Book. She even added that the book's mc has a sister and by using that character, continue to interact with her beloved brother. She Further awarded the novel's female lead with the system to force her to be in a relationship with her brother. Don't forget as the novel author/editor, she is omnipotent. Now where is the MC's book? WHAT DO YOU MEAN??? He has the book!! We have the book! We are reading it now! It's in webnovel. Yes, the world we are living in is made up, created and modified by that sister. By reading this webnovel book, he will know where are the treasures. Don't believe me? Click about this book and check out the author's name. BOOM! Yes, it's the 'younger sister'.

The synopsis and title both say his sister wrote the story, but the story's content says he did. Furthermore, one of the tags is "singlefemalelead", he isn't female.

😳🤔

I’m disappointed, the summary got me looking forward something different...?🤔😑

The book protagonist seems a bit of a young master level donkey pit.