Medline is great on all levels but what does it have to do with the author's work/product/topic? It's a database of biomedical articles. It's searchable using usual text search ("concept A" AND "concept B"), and has some additional features like MESH terms and metadata.
The author is talking about extracting entity-level information from those article and building knowledge bases. Medline provides access to the raw data, but it does nothing like what the article describes (well - there's https://lhncbc.nlm.nih.gov/ii/tools/SemRep_SemMedDB_SKR.html , so not entirely true. But it's hardly a final answer to the problem or even close to being usable enough that it makes commercial solutions pointless)
The author is talking about extracting entity-level information from those article and building knowledge bases. Medline provides access to the raw data, but it does nothing like what the article describes (well - there's https://lhncbc.nlm.nih.gov/ii/tools/SemRep_SemMedDB_SKR.html , so not entirely true. But it's hardly a final answer to the problem or even close to being usable enough that it makes commercial solutions pointless)