The phrase "there is no ethical consumption under capitalism" does not mean "therefore, death of the author always exists for all art the second it is made."

For starters, you will not die if you dont experience all art made. Its not food. Its not shelter. You will be okay if you dont watch some movies, dont read some books, and dont play some games. I promise.

But, more specifically, death of the author means to separate an author and their life from the work they create. If your purchase directly funds the author? You didnt separate the author from the work.

Death of the author is when you accept and understand that reading a story written by a shitheel from the 18th century is not supporting their shitheel opinions. That you can study the work and its influence on culture without that study or consumption being explicit or implicit support of the creators thoughts and opinions.

But when you pay an author for their work, you have supported the author. Period, thats what the word means.

Now you can fibble or quibble about morality of putting money into someones pocket all you like, but if the author is literally benefiting from your purchase, they are not dead. There has been no death of author.