All concluded that vegan diets were healthy for children as long as the parents knew the common deficiencies (B12) and fed their children enough calories. The study you cited is on my list because it seems you didn't read the results where it stated that most children were not eating fortified or supplemented food like Vitamin D, which could easily explain why they have a lower bone density.
* https://www.mdpi.com/2072-6643/11/4/832/htm
* https://link.springer.com/article/10.1007/s00394-021-02753-3
* https://www.mdpi.com/2072-6643/13/5/1707/htm
* https://academic.oup.com/ajcn/article/113/6/1565/6178918
* https://anthropogoniquescom.files.wordpress.com/2019/08/grow...
* https://anthropogoniquescom.files.wordpress.com/2019/08/grow...
* https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-277X....
* https://www.minervamedica.it/en/journals/minerva-pediatrics/...
* https://www.embopress.org/doi/full/10.15252/emmm.202013492
All concluded that vegan diets were healthy for children as long as the parents knew the common deficiencies (B12) and fed their children enough calories. The study you cited is on my list because it seems you didn't read the results where it stated that most children were not eating fortified or supplemented food like Vitamin D, which could easily explain why they have a lower bone density.