The point of encryption is to protect content from third parties. TLS-like encryption where messages can be read by server, is not protecting the content this way, therefore, calling it encryption is misleading. When average user asks "is it encrypted?", they're not asking "Oh I totally get that the developers can access the content but is it safe from passive eavesdropping in the network backend?", they're asking "Can anyone else read the messages?", i.e. "Are they E2EE?". To which the answer is no.