I would question your statement "Is it Secure?" first. In my opinion, no way of communication we have developed as a race is totally secure. Any thing can be exposed if the questioner is willing to expend enough time and resources to get the desired result. So the question then becomes "is what is being secured worth what it would take to unprotect it". Modern Generative AI has made the set of tools used to obscure electronic records suddenly not obsolete, just weaker at protection. I have long been a strong proponent of Steganography being used teamed with Encryption, because it is more difficult to detect [without a long time sample to generate comparison trends which would be able to trigger deeper research when they are violated] or you do not even know it is there.

An example from history is the Enigma device which was an excellent step up in the use of encryption tools, but was initially (by even slow manual techniques) defeated because of the use of the recurrent phrase "Hiel Hitler" which ended most German messages. Most Decryption experts stop analyzing the encrypted target when they find a 1st level result. Again most would not think of investing the additional time and effort to look further for Steganography in their first result. However, now a machine could be set to the task of checking for multi-level encryption for everything as a standard operating procedure.

So, is it worth it to protect and how much would it cost to use that level of protection is the first question you must answer. The second is what is in your control and what is not. A "totally secure" system would have to be all in your control and protected from intrusion. This is not possible in practical and cost effective terms for 5G technology operators. National boundaries and Legal constraints make this impractical. The question I would think you need to ask is "Is it a step forward in terms of Privacy and Security?" Again my answer would be not much as it will be implemented currently given the constrains on it in the environments where it will be implemented.

The security of data transmitted via the ubiquitous 5G communication network infrastructure is a paramount concern. While 5G offers incredible speed, low latency, and increased capacity, it also presents new security challenges. The sheer volume of data flowing through the network increases the attack surface and makes it more attractive to cybercriminals. However, efforts have been made to enhance security in 5G, including stronger encryption, improved authentication protocols, and network slicing to isolate different types of traffic. Additionally, advanced technologies like artificial intelligence and machine learning can be employed to detect and mitigate potential threats. Nonetheless, as with any communication network, achieving absolute security is a complex task that requires ongoing collaboration between industry, government, and cybersecurity experts to ensure the protection of user and cloud data in the era of ubiquitous 5G.