I think there's a problem with https://developer.apple.com/wwdc21/sessions/
It lists two Xcode Cloud sessions, "Explore Xcode Cloud workflows" and "Customize your advanced Xcode Cloud workflows" whose descriptions say: "we recommend first watching “Meet Xcode Cloud” from WWDC21."
But I see no session titled "Meet Xcode Cloud" anywhere on the session list. This indicates to me that the session is missing somehow.
(I wonder if other sessions are missing, too. The "multiple product pages" A/B testing feature for App Store Connect suggests to me that there'd be a "What's new in App Store Connect" session this year, but I don't see one.)