EU OPS 1.430
An operator shall not use an RVR of less than 800 m for a visual approach.
Paragraph (g) in Appendix 1 to para 1.430, actually, but I get your point. Written just below circling approaches (different para, I concede) and quite an anomaly - think about it -
800m! That's ILS territory!
The US equivalent is:
Originally Posted by the FAA Aeronautical Information Manual
• “[A visual approach is] an approach conducted on an instrument flight rules (IFR) flight plan which authorizes the pilot to proceed visually and clear of clouds to the airport;
• “The pilot must, at all times, have either the airport or the preceding aircraft in sight;
• “[The visual] approach must be authorized and under the control of the appropriate air traffic control facility; [and],
• “Reported weather at the airport must be ceiling at or above 1,000 feet and visibility 3 miles or greater.
The Australian rules are something similar. (Yes, I
know we are talking the EU here

)
... but the point is: 800m as a minima for a visual approach??

That simply has to be an error, or intended to refer to something entirely different.
... The visibility is 2 km and you see the hill unmistakably and the lake that lies after the hill ...
A shortcut if you are visual is fine - do 'em myself. 2000m vis is pretty foggy to be flying a jet around terrain, based on personal knowledge, though.