Regardless of the other comment, you're right, the alt text is wrong. Alt text is used by visually impaired users to understand what the image is about and is not the place to put the title of the XKCD.
This, I do the exact same!
Regardless of the other comment, you're right, the alt text is wrong. Alt text is used by visually impaired users to understand what the image is about and is not the place to put the title of the XKCD.