This can be considered solved.
Big thanks to Customer Support Engineer Kirill who let me know the KB article is outdated a bit. There's a slight modification in the query.
What I originally entered:
Could you please replace this query in step 10:
SELECT
v_GS_COMPUTER_SYSTEM.Name0
FROM
v_GS_COMPUTER_SYSTEM
WHERE
v_GS_COMPUTER_SYSTEM.Description0 LIKE 'OS X 10.%'
And the updated query:
SELECT
v_GS_COMPUTER_SYSTEM.Name0
FROM
v_GS_COMPUTER_SYSTEM
WHERE
v_GS_COMPUTER_SYSTEM.Description0 LIKE '%macOS%'
And I'm calling it a success.