There is
undoubtedly an error in either the transcript of the 0800 SPECI or in what was transmitted.
The ATSB report also includes a list of reports for Norfolk. Here’s what the list says was the content of the 0800 SPECI:
SPECI YSNF 180800Z AUTO 29008KT 9999 OVC011 21/19 Q1012 RMK RF00.0/000.0
Note the "9999". If that's what the actual SPECI was, there must be an error in the transcript (how many more are there?) or there was (another) mistake in what was transmitted.
Here’s what the list says was the content of the 0902 SPECI:
SPECI YSNF 180902Z AUTO 20007KT 7000 SCT005 BKN011 OVC015 20/19 Q1013 RMK RF00.0/000.0