Ah sorry, I asked in Discord and someone linked me here. As for your question, yes, as far as I can tell every song from Epic Yarn that is a remix of an existing Kirby song was arranged by the HAL sound team, since Tomita was already finished with the OST by the time the game became a Kirby title. So for the sheets we have on site, that would be World 7 ~ Dream Land, Gourmet Race, Butter Building, Vs. Meta Knight, and Halberd. It's pretty clear to me that Ando did all of those except for Gourmet Race, but I totally get if you don't want to list a specific arranger since there's no actual crediting.