After clearing all the cache again and re-enabling the lazy load option in the theme panel, I used the network tool in Chrome DevTools to confirm that the images are correctly deferred until they are in the viewport. I was wrong, it works perfectly. I still haven’t optimized the LCP for other pages, but for now, single posts are hitting a performance score of 98 on mobile and 100 on desktop. I’m very happy with my purchase and thank you for your help.