I don't know why Apple removes some sessions instead of just marking them as outdated (if the are). Maybe this article will give you a clue: "Apple’s copyright claims ripped down a fan’s archival WWDC YouTube channel" here:
https://www.theverge.com/2022/11/6/23443215/apple-copyright-claims-ripped-down-fan-archival-wwdc-youtube-channel
The video you are looking for can be found here: WWDC2018 Session 220 High Performance Auto Layout in mp4 format.
Laconical
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