Have improvements been made, in the last three years, in the...

Have improvements been made, in the last three years, in the extraction of REEs from eudialyte?

I ask this because I have been reading an article "An Overview of Beneficiation and Hydrometallurgical Techniques on Eudialyte Group Minerals", Mining, Metallurgy & Exploration (2020) 37:39–50.

The article concludes:

"As described in this paper and many others, eudialyte groupminerals have a complex chemical formula and structure, making it difficult for a clean separation from its gangue. Based onthe previous research done in employing different mineral processing techniques, it has not been possible yet to efficientlyupgrade the mineral. Further investigation into the beneficiationof eudialyte should focus on the mineralogy and developing aprocess specific to the eudialyte mineral. As discussed before, the gelation experienced while leaching eudialyte is an important process and economical hindrance, so it is essential todiscover a method to minimize this gelation."

Are the authors talking through their respective hats?