I have, and I’ve made multiple posts from mobile. Click the progress bar to access the post scrollbar.
I’m using the site right now. It loads multiple posts quickly in one go. You can also watch my video. Same thing.
I’m assuming you mean “copy the code from the site and run it yourself”. What I meant is presentation (what we see), not internal (what we can’t see). I couldn’t care less how it’s implemented internally as long as it does it fast (which it does; faster than a page load would take).