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Reading the article I found this:
parts of Malawi saw a maximum temperature of 43C (109F), compared with an average of nearly 25C (77F)
As I expected the actual temperature increase was 32 °F, not 68 °F.
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Except the error should have been 32 (which you go on to explain, because we add 32 to start a conversion) and the correct temp difference should have been 36 (20 * 1.8) which is shown later in the article.
I can see getting that wrong, but the actual temps quoted seems to correctly portray 32 opposed to 36 like we would expect.
Just rounding errors or some other oddness?