Yes this looks very encouraging to me in terms of individual safety, and multiplied by the current chance of any one person being infected suggests that becoming infected on a train is not something to be overly concerned about.
However, a lot of the measures currently in place are about reducing a small risk to an even smaller one to keep transmission down to an acceptable level, so I'd say it doesn't mean the government should choose to abandon social distancing on trains.
It does suggest that for something like IC travel on trains, perhaps one household bubble per double seat/table would be a proportionate way forward.
It does look very encouraging to me.