Specifically the data coming through via:
https://api.tfl.gov.uk/trackernet/PredictionSummary/D/?app_key=
In the same feed at the same time i am seeing this, confusing because the same train has 2 different destinations:
S=“072” T=“15” D=“147” C=“3:30” L=“At Earls Court Platform 2” DE=“Edgware Road”
S=“072” T=“15” D=“147” C=“11:00” L=“At Earls Court Platform 2” DE=“Check Front of Train”
And yes to a passenger the DE= string will not matter so long as they get on the right train, however to a programmer who relys on the information in the string things like that can play havoc 
thanks
Neil