Interesting article. I also found this one that says "Although the review questions the effectiveness of routine supplementation, experts emphasize that vitamin D remains essential for overall bone health. Vitamin D helps the body absorb calcium from the intestines into the bloodstream, supporting bone mineral density and maintaining strong bones. Without adequate vitamin D, calcium absorption declines, increasing the risk of weakened bones and osteoporosis over time."
https://www.msn.com/en-au/health/other/calcium-and-vitamin-d-supplements-may-not-prevent-fractures-major-study-finds/ar-AA25MpcO
Also, these articles don't say anything about taking Vitamin K along with calcium, as K helps direct calcium to the bones. There's discussion about studies showing high doses of two forms of Vitamin K can be helpful for osteoporosis. Look in this support group under the heading: "Vitamin K: High Doses of MK-4 and MK-7 Show Promising Results"

Also of interest is this study that says "Although bone mineral density (BMD) is strongly associated with fracture and postfracture mortality, the burden of fractures attributable to low BMD has not been investigated." It concludes, "A substantial health care burden of fracture is on people aged <70 years or nonosteoporosis, suggesting that treatment of people with osteoporosis is unlikely to reduce a large number of fractures in the general population."
https://academic.oup.com/jcem/article/104/8/3514/5427152