Earlier quoted context omitted.
"Gets the shaft" implies harsh or unfair treatment. It was startup guy's idea to sell the company, and startup guy's lack of abilities which led them to the mess in the first place. It seems like startup guy is getting exactly what he deserved?
I think from a purely moralistic perspective this is unkind. Perhaps they are getting exactly what they signed up for. But how many naive purely technical people have been short changed by similar antics in the past
In other words sole-founders have missing skills which are likely to be exploited by those who have those skills.
Perhaps this implies that a founding team with a mixed skill set (creation, sales, business) will likely have long-term better outcomes. Perhaps it implies that sole-founders would be well advised to pay for competent advisors in the areas they are weak.