I am reading thru this and it is a good, recommended read however I am getting slightly annoyed with academic attitude of the author. Like batman in the cartoon I want to slap him but not for "sloppy market research". But for using the term "market research" at all. (This is essientially the first and maybe the second point reiterated.) Suppose you were a cook with your own restaurant. How do you figure out what work…
I have found that people here simply respond well to a little bit of formal language, so it's not surprising the author would habitually use it. People tend to take it as an implicit promise that you know what you're doing.
You can usually get away with a little semantic trickery though; of course we do market research, we're a serious business after all. It's just that in the startup context, the best way of doing this is trying stuff and actually observing behavior.
When called on the bluff, invent a qualifier: Oh of course market research works differently in the startup context; we call it "highly iterative" market research. (Schnelliterationsmarktforschung).