Custom challenge pages

Hi, I'm trying to create a custom challenge page per https://developers.cloudflare.com/support/more-dashboard-apps/cloudflare-custom-pages/configuring-custom-pages-error-and-challenge/#step-2-select-your-custom-error-tokens

This tells me to use the token ::CAPTCHA_BOX:: where the CAPTCHA will be placed. I did so, but it seems like no matter what I do, the additional text:
example.com
Checking if the site connection is secure
example.com needs to review the security of your connection before proceeding.
Ray ID: 000000000000000
Performance & security by Cloudflare

is displayed around the CAPTCHA box.

However, I've seen other sites protected by Cloudflare that also have custom challenge pages without this, for example, Dcard.tw (basically Reddit in Taiwan). It's not any CSS or injected JS trickery, there's absolutely no mention of the phrase "Performance & security by Cloudflare" in the page source whatsoever. How are they doing this?
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