I think it is probably largely correct that the fuel distribution would not be an issue if you injected at the port. However, if you have ever looked inside an injected sheet metal intake, you will see it gets wet with fuel in there. So, despite the injector location, fuel moves around in the intake, and will therefore be subject to some extent to the airflow issues inside.
Also, with this intake I will be positioning the injectors as high up on the runner as possible. The advantage that carbs have over injectors in these applications is that the fuel acts to cool the air/fuel charge as it leaves the carb and travels down the runner to the port. When you inject right at the port, there is less time for this cooling to take place, so a port injected engine where the injector is very close to the port will be down on peak power a little as compared to the carbs. On the other hand, if you position the injectors up high on the runner, you get most of this effect back, albeit with less low speed control. As I understand it, Formula 1 engines put the injectors up at the top of the plenum, where the carb would normally be, in order to maximize this effect.