According to CPE Use of English, "content" and "contents" have different meanings. But which meanings are they talking about? The only singular form is given in #4.

4 [singular]
(following a noun)
the amount of a substance that is contained in something else
• food with a high fat content
• water/moisture/protein/DNA content
• the alcohol content of a drink

(Oxford Learner's Dictionary)

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    Could you edit your post to tell us exactly what CPE Use of English says? What was the exact sentence or paragraph? Where does it say this? Please provide a link if possible. See Details, Please and the Contributor's Guide (Asking) for more tips. – Em. Sep 1 at 6:15

From https://getproofed.com/writing-tips/word-choice-content-vs-contents/ :

Content is an uncountable noun. We use it when referring to the contained thing as an undifferentiated whole (e.g., the “content of a speech”). Contents is a plural countable noun. We use it when the things in a container are separate and countable (e.g., book chapters in a “table of contents”).

So #4 in the link provided in your question would be an example of the uncountable noun (i.e. fat content).

An example of the usage for "contents" would be "she went through the contents of her purse searching for her pen". The purse is the container and the items are the countable things.

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