It's not FUD to talk about apple's software getting buggier, it's FUD to appropriate someone's rant, sensationalise it and then put the responsibility on Arment.
It's the difference between you stating that Node.js has been forked and someone writing "The server-side Javascript community is now torn apart, according to engendered". It's technically true, but it's clear that second one has other implications.
This is Marco's post: http://www.marco.org/2015/01/05/popular-for-a-day
"This morning, my words were everywhere, chopped up and twisted by sensational opportunists to fuel the tired “Apple is doomed!” narrative with my name on them. (Or Tumblr’s name, which was even worse.) Business Insider started the party, as usual, but it spread like wildfire from there. Huffington Post. Wall Street Journal. CNN. Heise. Even a televised CNBC discussion segment."
"Instead of what was intended to be constructive criticism of the most influential company in my life, I handed the press more poorly written fuel to hamfistedly stab Apple with my name and reputation behind it. And my name will be on that forever."
Now, why do you think Marco is afraid of speaking out? Do you genuinely think that he's afraid his relationship to Apple is damaged because it might threaten future business or because he feels he's responsible for these articles?
From what I and others have experienced (and the rest of the article), there's a climate of frustration, not fear, in the Apple developer community – but even in this article, being angry at incompetence doesn't sound remotely as exciting as being afraid of a large corporation. Hence the F in FUD.