Apple: "We have informed the developer and apologize for any confusion that we have caused."The Wordpress app linked to web payments for two years on the App. Maybe Apple was very easy on him because that link wasn’t front and center in the App.
Apple didn’t backtrack. The offending issue was no longer a problem in the Wordpress app, and so the problem Apple had with them was no longer valid. Problem solved.
Another day where Apple continues to apply their guidelines evenly, and disgruntled developers take to Twitter to air their grievances and try to win some online support.
Somehow Apple apology (for their wrongdoing) was not featured in your post. It appears that Apple were overzelous in this case and insisted on WordPress implementing IAPs which is a reflection of their state of mind. Obviously, given a flood of complaints lately from app developers, Apple is going to be careful for a while and avoid potential pitfalls as much as they can.