Looking at the source code with web inspector it seems to be powered by 3D gaussian splatting and BabylonJS (https://doc.babylonjs.com/features/featuresDeepDive/mesh/gau...).
Babylon.js is funded (owned?) by Microsoft so anytime you see web 3d on a Microsoft site it's almost certainly going to be using that.
Babylon.js is funded (owned?) by Microsoft so anytime you see web 3d on a Microsoft site it's almost certainly going to be using that.