there is quite a lot of public evidence they are using knowledge graphs.
e.g.
As Chief Product Officer, I’m excited to lead the charge of putting healthcare on the technology map by bringing cutting edge innovations like cybernetics, knowledge-graphs and the semantic web...
there is quite a lot of public evidence they are using knowledge graphs. e.g.
https://oliveai.com/media/olive-debuts-products-aimed-at-transforming-healthcare-through-automation/