You can have any speed you like ...
Just aggregate loads of 20MHz channels, when in the real world due to "competition" the channels are split between operators and rarely 20MHz. Cell concept needs a minimum of 3 channels per mast (120 degree sectors) and ideally 9 channels to stop the masts beyond the next one interfering.
Also up the QAM to infeasible levels only suitable for cable that needs perfect signals with no interference.
We were at the limits of bits per Hz spectrum for real world over 15 years ago.
This is NOTHING to do with 5G or Huawei kit, just a promo. The 5G is about integration of different infrastructures and to a secondary extend channel aggregation between bands.
There is no free lunch. No-one can repeal the laws of Thermodynamics, which is basis of Shannon-Nyquist law.
Really annoys me to see these nonsense press releases. Even if every lamp post was base station no-one is even going to see consistent 100Mbps, that would only be like universal WiFi. Note that even WiFi speeds are nonsense as they quoted for ONE connected user, perfect signal BOTH ways and no co-channel interference and MIMO in the CLIENT, not just base.
Don't even get me started on nonsenses such as "White Space" or "Spectrum Sharing",