No. Markup was removed as the storage method in version 4, several years ago. It is still used in a handful of admin areas. But not pages.
You can still type it, and the editor will recognise it and translate, but the data is not stored as markup, so pasting it in doesn't work.
You can also insert Markdown which will be automatically converted to Confluence format (and cannot be changed back. The reference is on the page you linked to:
I checked it on the latest version of Confluence Cloud and it is still there.
If you want to keep it in Markdown format, then I would recommend you use my plugin that Robert mentioned.
Two vulnerabilities have been published for Confluence Server and Data Center recently: March 20, 2019 CVE-2019-3395 / CVE-2019-3396 April 17, 2019 CVE-2019-3398 The goal of this article is...
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