Notice such words as modicum, studies like this, and preliminary. No one is going to commit serious resources to a study unless you have some preliminary data on the subject that shows a general trend towards your conclusion. Further, studies like this provide a basis for studies associated with doctoral theses by inspiring grad students and giving them direction. They are very important for these reasons alone.

Also, and for the life of me I can remember where, I read that first impression generally aren't wrong. The general feeling you get off people within one minute of conversation isn't usually that different than what you'd feel given the chance to get to know them. In fact here and here are a couple of sources. I think I even have a book packed away somewhere about how this snap shot like perception can extend beyond social interactions. The human brain it seems was made for very quick accurate situational awareness and on a level we can't really control. A few minutes with a person should be way more then enough to get a very good feeling of your compatibility.