I went to the wikipedia link you had and there is no mention of Quadrat Capital as being around for ages. Searching the company as well doesn't produce any substantial insight.

The earliest record I could find from the German Trade Register for Quadrat Capital GmbH was 07.01.2008
https://www.unternehmensregister.de/ureg/result.html;jsessionid=A935E6229A9462DAA3EA93C25D9FDA3D.web02-1

Matthias Woestmann is also a CEO at Quadrat Capital for the last 14 years (https://www.linkedin.com/in/matthias-woestmann-b87922119/).
The domain age for Quadrat Capital is just over a year old though.

The history and obscureness of the people heading Envion is highly ambiguous. 

Great concept of being able to move where the costs are low. Blockchain mining companies in China like BitMain have cashed out massively with the boom of cryptocurrency values recently. They don't need any funding to adapt to sustainable and more powerful rigs so if Envion is a true company, their return on investments are highly optimistic.

Grain of salt here people.