The intent of the feature seems to be to hide content until it has been laid out properly, which is generally a positive change to the experience because you can't read stuff while it is jumping around. In that sense, the website is "deliberately" stopping you from seeing static content in the same sense that browsers deliberately don't flash the raw HTML code onscreen before they have finished performing layout operations, but it seems unreasonable to imply it is malicious or defective behavior.
The CSS animation is a fallback to that intended behavior.
The CSS animation is a fallback to that intended behavior.