It's more about what you have done in the past. Have you written quality articles with working code examples? Have you written something hard in simple language in the past? That's what they consider.
In most contact forms, you'll only need to include the title of your next post - not the post itself. But, you have to link 1-3 previously written posts.
Simply, they are looking for clear evidence of your programming and writing skills.
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We strive for transparency and don't collect excess data.