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Using their definition, one would wonder what non-end-to-end encryption would look like.

Encryption at rest but not in transit.

What can that even mean for a videoconferencing platform?

The recordings for your favorite TLA review would be properly encrypted. I bet those agencies take security seriously. /s

This is incorrect. It still is encrypted in transit via TLS. There are encryption tunnels from point to point just not 'end to end'.