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Isn't this just telnet? Like last time people claimed huawei "injected back doors", nothing is being injected by them, and these are not backdoors, they are front doors, standard festures etc? But dressed up in a way to make it look scarey to someone non-technical? Sorry if I'm missing something here...

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A hidden door that nobody but the installer of the door knows about is generally referred to as a back door. If it was without the knowledge of the main device manufacturer, then it was injected.

its a telnet but you need to activate it first. often backdoors are simple shells like telnet or such services. but it usually requires some 'magic packets' or such things to open the port to it or start the service. if you look at the POC you see it's not simply making a telnet connection to a port, but it does some other stuff first to prepare for it.

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