The article page 3 mentions a crucial get-out-of-jail card that HN is taking completely hypocritically at face value.
Namely that NOAA adjustements are in response to Met Office/Hadley/UEA adjustements.
this should be setting off "tampered" alarm bells
Lets step away to make parallels:
UK Copyright extended to harmonise with US.
US copyright then extended to harmonise with UK copyright
HN response: The copyright holders are colluding to extend the term globally
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NOAA adjustments: We're harmonising because of Met Office / Hadley / UEA adjustments
HN: Yay science, nothing fishy could be going on here because Scientists.