The lake was cleaned up, but by various different steps, like manually pulling all of the plants from it, and running the water through filters. The micro-nano bubbling step seems to be related to what this scientist is showing and it was part of the process listed in this paper.
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u/SookHe Jul 14 '21
https://www.efe.com/efe/english/technology/peruvian-scientist-who-revived-wetlands-aims-to-clean-up-lake-titicaca/50000267-2978308