As explained in lots and lots of topics, major updates have to be seen by itch.io staff, and not all of them are approved. As for response times, please read the rules of this category. I'll let our admins know, anyway.
Thank you for your response. It's interesting to see that the moderation of this section is done by hand, because then it would be wonderful to figure out why the updates from demo versions to full games are not shown, not just the DLCs or extra content to the games. I'd very appreciate it if you added this to your report. Thank you.