It means nothing but this is what Zoom tells us we have. Encryption given "in the spirit" of their intentions.
> Zoom has always strived to use encryption to protect content in as many scenarios as possible, and in that spirit, we used the term end-to-end encryption.
> Zoom has always strived to use encryption to protect content in as many scenarios as possible, and in that spirit, we used the term end-to-end encryption.