I think most of them have some additional hair.
You can tell because you can sometimes see shorter bits.
Lucie has micro ring extensions. I wear tape in extensions, though nor for length anymore. Just thickness. I think some of theirs look amazing. I a slightly extension obsessed.
I actually started using tape in after I saw Dani wearing last year. You couldnt really tell apart from when it showed them getting ready and she had half her piled on top of her head to to style it. You could see the tape.
I assume they have people go in a redo them as tapes andbother types need moving every 6-10 weeks. Depending on how your hair grows.