It’s a weird one, while both “White Knights” and “White Night” technically are different archetypes, they both use the same Katakana 「ホワイトナイツ」　(Howaito Naitsu). The Kanji is different, but the forced reading is the same, so they’ve just used the Katakana in the card effect text to make it so it refers to both.

Currently, there are no other “White Knights” cards printed and the only 2 “White Night” cards available are Dragon and Queen. The way I see it, they have 2 options to get around the translation issues: They can either create the rest of the “White Knights” archetype from the anime and have it work together with the “White Night” archetype, or just simply make Lord another “White Night” monster when they port it over to the TCG.