As a cashier, I am certainly "able to" just hand you the goods and let you leave without paying, but in reality due to laws, regulations and good morals I am unable to do that.
The rep in TFA uses "we," referring to Google. Google is able to reinstate accounts, and The Google Ad Traffic Quality Team is able to reinstate accounts depending on their judgement of whether someone is violating policy. If they are not able to reinstate accounts, can you explain to me why they're adjudicating account ban appeals? Do they say "no" to everyone?
The key point here is that the agent(s) are responsible for interpreting the policy. They have decided that Droidscript violates their policy, and I personally have no opinion about that. But to imply that it's "out of [our] hands]" is dishonest.
Just say "upon review we've determined that your app violates our policies so we will not be reinstating your account."
That is not equivalent to what's happening here. There is no law preventing Google reinstating the account, and corporations don't have morals because they're not people. The only thing preventing them doing it is that the employees involved choose not to.
When someone points a gun at a cashier and says "this is a robbery and I'm gonna shoot you if you move a muscle," the cashier usually uses their ability to hold still out of concern for their safety.
The distinction matters.