Although it doesn't appear to say so in the doc page,
intitle expects an exact phrase, not a list of words.
You can currently see this by:
/2.2/search?intitle=get column array&site=stackoverflow
which currently returns one result with that exact phrase in the title, but doesn't return the many questions that have those 3 words in other arrangements.
To search for titles that contain a list of words,
/search/advanced route and pass multiple
title:... properties in the
which currently returns the question you expect as well as 5 other valid results.