But your conclusion and the paper's title is right:
"Increasing the number of masticatory cycles is associated with reduced appetite and __altered__ postprandial plasma concentrations of gut hormones, insulin and glucose"
One may also add (2012) to the title.
> Doesn't this suggest that if you want to eat a lot of food but don't want to absorb too much of it (i.e., are concerned about weight gain), you should chew less?
In the study they found that more chewing was correlated with higher satiety and lower food intake in the follow up meal. This may show that if you are concerned about weight gain you should chew more and then you'll naturally eat less.