Hmm, I don't want to dive too deep into AMP, but I do get a header on that page in Chrome Android.
edit: wait, no I don't. I get a header when I visit the page via google search, not when I follow the link directly. I haven't noticed this before because google is the only way I usually end up at AMP pages.
Example: https://techcrunch-com.cdn.ampproject.org/v/s/techcrunch.com...