I believe weight bearing, as in the weighted vest, will maintain strong bones, but not build bone. My understanding of the PT research is that to create new bone there has to be small fissures in the bone that the body then fills with new bone. Impact activity, and again I may be wrong, but I think it’s a jump from a height of 14 inches that will do this. Unfortunately for some of us, that may also cause compression fractures of the spine. And, again some of us don’t build bone effectively for whatever reason (metabolic, inability to absorb nutrients, genetic) so what may work for some people, like a 14” jump, may only cause a fissure and no new bone.

There does seem to be some research on vibration plates that shows benefits to muscle. Mayo Clinic has some info and there is an article from the Cleveland clinic where the author tried out various vibration plates.

“vibration throws off the way your body is used to moving, forcing it to activate small, rarely-used muscles and fire in multiple directions at once, thereby accentuating the natural muscle-building process. In that way, vibration plates also would seem to be an excellent tool for stretching and improving balance.
Even better, I could see using vibration to warm up. Stepping off the plate after each use, I felt limber and warm, ready to go. Indeed, studies show most of the performance-enhancing benefits of vibration are momentary.
Which brings me back to a sort of favorable skepticism. Not of vibration itself, but of its value. Right now, the benefits of vibration plates don’t seem to justify their cost, at least not enough to make them a must-have device.
If you’ve got the money, great. You wouldn’t be wasting it.”

Read his full article to see how he was using the plate - most benefit was during active engagement.
https://www.cleveland.com/healthfit/2011/07/vibration_plates_not_a_passive.html