Even taking the (flawed) premise at face value, there is still a mile of difference between Apple's walled garden for apps and other content, versus the Android ecosystem.
You're playing on two different meanings of the term "open". Because Android might not qualify as OSS, they create the implication that it's just as tightly controlled as Apple's walled garden. But that's not even close to true.
The point of the OP's argument seems to be something like "Apple isn't open, and now this proves that Android isn't open either; hence, Apple and Android are the same in this respect". This argument is fallacious.
Even taking the (flawed) premise at face value, there is still a mile of difference between Apple's walled garden for apps and other content, versus the Android ecosystem.