You never actually state a question though… 
But yes, Spotify has an issue where multiple artists with the same name will get the same Spotify ID (e.g., spotify:artist:5KEjVMaEdZ1tHgaAIkZCVp). Spotify is a lot better than Deezer though (same artist as Spotify ID, but Deezer URL) and will sometimes have proper unique IDs even for artist that have the same name. E.g., there are multiple “Yasmin” artists on Spotify, even if some individual ones of them are actually multiple "Yasmin"s conflated.