Bilbao don't just sign players that are born in Basque (which includes France) but also players who have learned their football playing for a basque team in their youth. Whilst limiting themselves signing top players who might want to play for the club, there is nothing racist about the policy.
I also completely understand what the Napoli president is saying. He is not saying anything negative about Africans as a person, but simply doesn't want to sign someone who will go missing for a month in the middle of the season and pay their wages, it's an unwanted distraction and hindrance - hence he's perfectly in his right to say that. He's not saying he's refusing to sign players based on their skin colour. Whilst it didn't affect Liverpool's results this season when they lost Mane and Salah, imagine if they had lost the league title by 1 point but they lost or drew one or two matches when the players were away? As a Liverpool fan or owner you'd be more than annoyed I'd imagine