I don’t think the certificates use the CEFR levels (A1 to C2). Mine just says “Advanced 2” or “Advanced 1” depending on the language. It would be a bit problematic if they had used CEFR terminology because LingQ measures reading comprehension more than anything else, rather than writing or speaking skills.
That said, I do think the Beginner/Intermediate/Advanced levels in LingQ are meaningful because I can read both Japanese and French at an “advanced” (for a learner) level. I could read a modern novel, albeit at a much slower rate than a native speaker and with 80-95% comprehension. I have passed the JLPT level 2 (second highest of five), which is probably around a B2 and also the unofficial minimum to work in a Japanese-speaking environment. I would consider this to be advanced even if well below the level of a native speaker (especially one with an advanced degree in the humanities, etc.).
