The problem with getting info from "some bloke in the USA" is you can't really rely in the information.
In AIM/FAR 2008 by Charles Spense (link below found on Google Books) in the Pilot/Controller Glossary, he quotes "Visual Approach [ICAO]: An approach by an IFR flight when either part or all of an instrument approach is not completed and the approach is executed in visual reference to terrain." So maybe it is defined by ICAO.
He unfourtunately does not say where he gets his reference from.
William Kershner seems to say the same in his book "The Instrument Flight Manual" but I can't see the whole page to see if he has a reference.
If the definition is correct it still does not help us with the answer to the question because if the instument approach is not completed does that mean it is no longer valid and therefore there is no missed approach to be flown?
Off topic, I would suggest to anyone who writes their own 'Quick notes', 'Blue Brain' etc to write the reference for any info/quotes/rules in the margin for ease of updating and for anyone else that you share you guides with. Eg Ops Man Pt 1 CH7