Is it appropriate? I don't see the problem, if people aren't interested, they can not read them or even downvote them.

You're asking a loaded question though. Louie will get a positive karma bias by being the first good optimal philanthropy article in a while. I think your article is probably better than his but might not rank as high, and it is even less likely to rank as high if submitted simultaneously with three other optimal philanthropy articles.

Waitingforgodel's article is good, but isn't written for a LW front page audience so it won't do well in terms of karma. Yours similarly doesn't do the intensive linkback to LW thing popularized by Eliezer.

Of course it doesn't really matter, since it doesn't sound like Roko will be judging based solely on LW karma score.