> (After lying about it for years)

Correct. But currently, as far as is known, they actually do provide it. Which, practically, is what matters because other than WebEx there are no comparable alternatives that I'm aware of.

Jitsi: https://jitsi.org/e2ee-in-jitsi/

Jitsi is discussed in the comment below yours in this sub-thread.

I have extensively tested Jitsi and it does not do what I need it to do (support E2EE video conferencing for teams larger than 50 people).

People recommend Jitsi all the time, but I have yet to see any real-world cases of people actually using E2EE Jitsi meetings for large teams.