No, it isn't. The concerns presented by other developers aren't about what it is NOW, but what it could become in the future.
Some developers see it as the beginning of a march towards a more walled garden in Windows. This guy either doesn't see that as a future possibility down the road, or isn't answering the question in that context. The question itself is no less valid because this guy isn't concerned.
I don't see that as a bad thing per se.... for the security/sandboxing alone. That said its pretty obvious that is not their chief complaint.... they are deathly afraid the store takes steam marketshare. They like taking the % off the top vs. giving it to ms.
Also completely unrelated.... hulu announced their app and put up a video to go with it. Overall looks like its going to be very good. http://www.theverge.com/2012/10/22/3539418/hulu-plus-app-windows-8-available-sony-acer-tablets