As someone who currently works in wireless comms I think we can say "5G" is a pretty meaningless term. I presume, as you suggest, it originally referred to the

As someone who currently works in wireless comms I think we can say "5G" is a pretty meaningless term. I presume, as you suggest, it originally referred to the new LTE but honestly the definition "literally any wireless tech created between about 2015 and about 2020" seems to be universally accepted!