Maybe it's just me, but this reads like an attempt to say they recently received another national security letter.

I think this thought is driven by the headline, which I suspect has been changed (perhaps on advice of a lawyer!?).

The article body just talks about how they respond to an NSL, clearly all steps taken under direct and careful legal advice.

So the title might have been "What our Lawyers do When we Receive an NSL".

Well since our honest feedback, they added a footnote “Please note that these best practices do not constitute legal advice. You should consult an attorney if you have any questions in how to respond to requests for information from government agencies. For example, even with the nondisclosure requirement, National Security Letters expressly permit the recipient to consult “an attorney to obtain legal advice or legal assistance with respect to this letter.”