Truth is, the news broke three times, each time differently. Seconds after the event...
1] Sunderland score, the ball appearing to clearly cross the line, but the goal does not stand. Has Hawk-Eye buggered up..? The media does not tell us. Hence the first comments.
2] News breaks again. Hawk-Eye has signalled a goal, but Ref Martin Atkinson has over-ruled it. What's going on..? Are refs allowed to do this..? Again, the media do not tell us the truth. Hence further comments.
3] Hawk-Eye has signalled a goal. The ball has indeed crossed the line, but Atkinson has blown his whistle for a foul only split-seconds earlier. Truth at last. Guess how long it took for that to break..? Nearly 10 minutes, depending on the media people were tuned into. Further comments, some confused.
Now you know why people made the comments they did at the time. That old thing about hindsight and 20/20..?