Ahh, sorry, I didn't notice before that the PageSpeed Insight link you sent was showing origin data.
Given that this is a brand new page, it makes sense that this isn't enough real-world data to show for it, so instead PSI is showing you the data for all pages on your origin.
Search Console is doing a similar thing, it groups pages with not enough data together based on similar HTML structure, and if there isn't enough data even for pages in a group, it will fall back to using origin data.
I would recommend figuring out which pages on your site have high CLS and fixing those pages, then that should improve the numbers you see in PSI (after 28 days).