* "slavery-backed price dumping": There have been more than enough reports on the gruesome working conditions in Chinese factories. They are so widespread and notorious, they got dedicated their own Simpsons "couch gag" (https://www.youtube.com/watch?v=XEki-IBdop8). And yes, I consider this dumping - because a company that operates to Western working conditions has no way of competition against people with 80-hour workweeks, armies of children and adhering to safety protocols.
* For industrial espionage, the same (e.g. Nortel, Dupont, Transrapid, Volkswagen/First Automotive Works, plus countless cases in the German Mittelstand - even the German Constitution Protection Bureau warns about this: https://www.tagesschau.de/inland/verfassungsschutz-china-spi...). According to a (bit dated, though) report, up to half of Mittelstand companies have reported Chinese cyber-espionage: http://www.sueddeutsche.de/wirtschaft/industriespionage-was-...
* For buying shells of doomed European companies, have a look at e.g. https://www.morgenpost.de/wirtschaft/article207409333/Chines... - companies from as humble as trash burner EEW to such household names as Krauss-Maffei and Syngenta.
Is your assumption here that no non-europeans (including the Chinese) have contributed to solar research?
>by a combination of slavery-backed price dumping, industrial espionage, knowledge-transfer extortions (aka "to do business in China you have to find a local partner and work with them") and outright buying of the shells of doomed European companies.
You will need to provide massive objective evidence (i.e. not 2-3 links from googling "china solar" ) before anyone believes that giant assertion. Personally, I neither want a $5000 made in USA iPhone or a $99 bottom of the barrel chiPhone, but YMMV.