WalterM140 twisted the electrons to say:
Well, that's interesting, but it seems to indicate that the Brits
were gambling they could induce the Argintines to attack incorrectly.
Not very prudent.

The reason the Argentines came in low was Sea Dart, and the reason they
knew to come in at low to beat Sea Dart[1] was because they had two Type
42s of their own. However it's only prudent to assume that it if someone
sells you military kit that the version they sell you isn't as good as
the one they use themselves, so they might have been concerned that a
pop-up attack would have left them fatally exposed to Sea Dart[2]?

[1] Though I believe they was a successful engagement with Sea Dart
against a target at 50 feet?
[2] Though, IRIC, the Type 42s (and HMS Bristol) where never deployed
into San Carlos Water.
--
These opinions might not even be mine ...
Let alone connected with my employer ...