Thanks for sharing. From reviewing your site both manually and using the tagassistant.google.com service, I can see that visits to your site are being recording with the GA4 snippet you have placed via Site Kit.
To troubleshoot this further, and determine why you’re not seeing updated traffic on the Site Kit graph, please share a screen recording of your experience browsing the Site Kit dashboard, and then selecting a different date range (ie. From the default 28 day reporting period to the 7, 14 and 90 day reporting period). You can use a service such as Loom or RecordIt to share a screen recording, while using the same form previously used to share this privately.
While displaying the different reporting periods, please also keep your Chrome browser’s console tab open, displaying any console errors that may appear. I can then check this with the team.
Let me know if you have any questions with the above.