I'm a bit of a fence sitter so I might actually be their target market. Very athletic, a bit health concious but not crazy about it in regards to diet. If I am eating out, usually my macros are not a big part of decision making. If there is a meatless option that might actually be good for a bit of a fibre boost, considering all the other protein I am intaking.
It's important to remember also that not athletic individuals are high achieving bodybuilders with super strict macro diets. Most other sports only require a moderate attention to diet, especially at an amateur level. Bodybuilding is very diet focused, rather than strength and skill focused.
Like all burgers this is a high protein, low fiber food option. It probably has more in common with your protein shake, being high in pea and other proteins but also has a high amount of sodium. This is a splurge food like any burger is. If you are looking for fiber, vegetables have them. Also impossible burgers taste better as they smell like coconuts instead of peas when they are cooked.