I looked it up and the answer I got was basically: "While there isn’t an ACTUAL OsteoStrong machine on the ISS, the concept of using specialized machines to maintain bone density aligns with the challenges faced by astronauts in space. These innovative approaches help mitigate the effects of microgravity on bone health. 🚀🦴"

My thought is that your medical person knows that they have machines on the space station that are used to prevent bone loss while in zero gravity and maybe he just assumed it was an actual OSTEOSTRONG machine. I'm CERTAIN that if NASA chose any ONE of the Osteostrong devices to put on space stations for the explicit purpose of increasing or preventing bone density in astronauts, the OSTEOSTRONG ORGANIZATION as well as each of their franchises would be SCREAMING JOYFULLY ON ALL SOCIAL MEDIA PLATFORMS that amazing news. I've never seen mention of that on the OFFICIAL OSTESTRONG website, nor on Facebook, Instagram or in my local franchise. No emails, no special MEMBERS ONLY ZOOM events... nothing. And trust me I WISH that were true. NOT that I don't believe it would work in zero gravity - I just wish they would do it so that Osteostrong would be fully validated with the National Aeronautics and Space Administration's endorsement!

Here's a statement I found per a NASA document I located here:
https://www1.grc.nasa.gov/space/human-research-program/computational-modeling/musculoskeletal/
"The Computational Modeling Project developed computational simulations of humans using several exercise devices that might be used during an exploration mission...

The Computational Modeling Project produced device models of the Advanced Resistive Exercise Device (ARED), which astronauts currently use onboard the space station and is the first exercise device experimentally demonstrated to reduce, but not eliminate, both bone loss and muscle deconditioning.

ARED is, unfortunately, unable to fit within the confines of an exploration spacecraft, so the project delivered an integrated model of a human using the Hybrid Ultimate Lift Kit (HULK), a potential next generation exercise device, to perform squat and heel raise exercises. The project also delivered a bone turnover model capable of predicting bone mineral density, a measure of bone health, as a function of whether or not the astronaut exercised during a 180 day mission."