No it‘s not. You linked to Meta showcasing their proprietary interoperability solution, not some new standard being showcased.Hi, uh, it's a thing actually
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To comply with DMA, WhatsApp and Messenger will become interoperable via Signal protocol | TechCrunch
Meta today is offering more details about how it plans to make its messaging apps, WhatsApp and Messenger, interoperable with third-party messagingtechcrunch.com
Please don‘t fall for the „Signal protocol for the win“ bait that‘s been flooding discussion sites, it‘s not what news sites make it out to be (hint: it‘s only Meta saying „to foster e2ee, please use the Signal encryption protocol we already use or show us another method that‘s as secure“. E2EE is not interoperability, it‘s just encrypting content).