To provide part of my own answer, it looks like snapshot does not have HTTPS installed. I went into Configure apk and changed all the HTTPS to HTTP. Now update lists yields:
[http://downloads.openwrt.org/snapshots/targets/bcm27xx/bcm2712/packages/packages.adb]
[http://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a76/base/packages.adb]
[http://downloads.openwrt.org/snapshots/targets/bcm27xx/bcm2712/kmods/6.6.71-1-ef49ef1f4d2e1ebcd84ddb229bb855f2/packages.adb]
[http://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a76/luci/packages.adb]
[http://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a76/packages/packages.adb]
[http://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a76/routing/packages.adb]
[http://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a76/telephony/packages.adb]
[http://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a76/video/packages.adb]
OK: 10876 distinct packages available
But still a few errors:
fetch http://downloads.openwrt.org/snapshots/targets/bcm27xx/bcm2712/packages/packages.adb
fetch http://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a76/base/packages.adb
fetch http://downloads.openwrt.org/snapshots/targets/bcm27xx/bcm2712/kmods/6.6.71-1-ef49ef1f4d2e1ebcd84ddb229bb855f2/packages.adb
fetch http://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a76/luci/packages.adb
fetch http://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a76/packages/packages.adb
fetch http://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a76/routing/packages.adb
fetch http://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a76/telephony/packages.adb
fetch http://downloads.openwrt.org/snapshots/packages/aarch64_cortex-a76/video/packages.adb