That's completely a false sense of security with 5G systems, because the way it achieves that high bandwidth is by literally “steering the beam” to follow you, i.e. precise location surveillance is an implicit part of using it:
https://arxiv.org/pdf/2301.13390“The initial access period includes the transmission of beamformed SSBs that provide the UEs with a basic synchronization signal and demodulation reference signals. This allows for UEs to save power by going inactive and rejoining the network at a later initial access period. At the physical layer, the UE will receive the SSBs from a single antenna or using one or more spatial filters, such as a multi-panel handset used to overcome hand blockage. The UE will use the received SSB for synchronization and determining the control information. The beam reporting stage includes one or more possible SSB CSI reports which are transmitted in the random access channel. The report includes information for the strongest serving cell and may include a set of the next strongest cells within the same band to assist with load balancing. The number of reported additional cells depends on the carrier frequency, the previous state of the UE in the net- work, and the bands being monitored. In a newly-active state, the UE reports the top 6–16 additional cells across each active frequency range. This reporting helps to manage handover and mitigate cell-edge interference. In the final steps, the UE has connected to a serving cell and is ready to start receiving data. Further beam refinement and channel estimation can occur by transmitting reference signals with more precise beams. Although not specified in the standard, a typical CSI-RS would cover smaller portions of the reported SSBs’ directions or combine coherently across a multipath channel. Using more directional or precise beams can increase the SNR–thereby improving the channel estimates and beam alignment. Beam refinement can also be used to adjust the beamforming slightly to track highly mobile UEs.”
Your linked article even agrees: “Carriers can still see which cell towers your device connects to, use the strength and angle of your device’s signal to the tower, and then look up your device’s unique cellular identifier to determine your general location. Your location may never be private when you’re connected to a cellular network”
Fun fact: modern Wi-Fi standards do this too and it's possible to use the backscattered emissions to see through your walls lol https://www.popularmechanics.com/technology/security/a425750...