Clippard has pitched wonderfully, but it's not like he's expected to have an ERA under 1 so yes, he has been lucky. I don't think the writer is saying Clippard is going to blow up, just stating that Clippard has been lucky, which is obvious.
The part about allowing other pitchers runners to score is a decent point.
I do believe the pitcher has a little control over BABIP though many people believe they have zero. But, BABIP can vary a lot. Look at Mariano Riveras 2006 vs. 2007 season. He pitched much better in 2007 but, his ERA was 1.35 points higher because of a ridiculously high BABIP (.335) Balls were just falling in, it happens. (Sometimes due to bad defense)
Likewise, Clippard isn't going to be able to sustain a BABIP in the low 200's. Doesn't mean he won't be a good reliever. though.