The quote is taken out of context. From the article:

And finally, the full passage from which the quote was cherry picked: “Bottom line: Though Iran at this stage is not performing the activity necessary to produce weapons, it is working to close gaps in areas that appear legitimate such as enrichment, reactors, which will reduce the time required to produce weapons from the time the instruction is actually given.”

In other words, Netanyahu and the Mossad agree that Iran is in pursuit of a bomb and is continually closing in on that objective; that it has advanced on two tracks, uranium and plutonium; and that it has amassed enough five-percent-enriched uranium for several bombs, some of which has been further enriched to 20%. The only disunity between the two assessments regards the rate of enrichment.

Netanyahu said that by the summer of 2013 Iran will have finished the 20% enrichment stage and moved on to the final stage; the Mossad memo, written several weeks after the prime minister’s September 2012 address, says that Iran “does not appear to be ready to enrich it” – its 20% stockpile – “to higher levels.”

In other words, the discrepancy does not revolve around the fundamental issue of whether Iran is, in fact, “performing the activity necessary to produce weapons,” as stated, but rather around the speed with which such action is being taken.