Check the privacy policy: https://p2p.mirotalk.com/privacy
E2EE usually implies that your connection goes through the company’s server(s) before reaching your contact during communication. With Mirotalk, your connection is P2P. You connect directly to your contact. Your video stream never goes through the company’s server. And the connection is still encrypted of course.
So yes, your stream is encrypted. Honestly, if it wasn’t, no way they’d be in business as encryption is probably the bare minimum nowadays when it comes to any kind of communication.
Also of note, some providers have data caps. I haven’t looked at all providers, merely Nymvpn as I was interested. Turns out they have a 2TB/month cap. Might not be an issue for some, but might be for others.