In the context of the source material (the books by Frank Herbert, Brian Herbert and Kevin J. Anderson), the 'greening' of Dune/Arrakis is a very broad plot theme. So, the comment is not one of 'green washing' but in keeping with themes of the series.
Full disclosure: Haven't read all the books, nor am I looking to after reading a bunch during the pandemic.
Full disclosure: Haven't read all the books, nor am I looking to after reading a bunch during the pandemic.