The cause of anomalous (>40 K) high superconducting transition temperatures in mixed copper (III) oxides is one of the most, if not the most, intensively studied questions in condensed-matter physics. If the researchers believe their experimental system can answer those questions, "vast" and "unprecedented" would be appropriate.

Maybe just a combination of academic jargon and English not being the authors first language? At this point I would also not be surprised if language models are used for writing abstracts.