i've never come across the interview you mention. Closest I can think of is either that clip about vocal guides, or the press release back when they debuted where they talk about natural voices vs adhering to the "standard singing style" or whatever
But never have I read about NewJeans not practicing their vocals or not getting any training, nor any backlash about it. So if you find it, I'd love to see where your claim comes from
and you're right, it could have been a mistranslation that got deleted
if you go back to my post, you'll see i never said that part was about newjeans specifically, just about min heejin, and i don't get the impression the kiddos aren't practicing, it's clear from danielle's video that she in fact is practicing
i do believe it's a mistranslation now because i remember that i liked the post and it's not in my likes anymore, or somebody misunderstood it

prob the combo of this part and the one we talked about before