Did you even read the summary? Here - let me make it easy for you:
Right now, companies such as Apple, Google and others that issue so-called transparency reports are only allowed to report the volume of requests they get in increments of 1,000.
Did you get that? They didn't provide more detail because they are legally not allowed to beyond a range of 1000. If they could provide more detail, they would.
In fact, they are filing an amicus brief in the efforts of gaining permission to disclose numbers in greater detail.
Oh, and the list of companies fighting for permission to provide greater detail? Google, Microsoft, Yahoo!, Facebook and LinkedIn. Notice Google, who you claim publishes the precise number of NSL requests, is on that list.
Let's have a look at Google's transparency report for the US:
Oh. Look at that - Google does not provide precise numbers of NSL, as you claim.
It's simple - the US makes it illegal for companies to disclose in any detail greater than units of 1000 how many requests for information they receive. Thus the numbers for the US are, shockingly, in units of 1000. For Apple and Google.