Your right,but I think it COULD have been the Underground looking at the footage.
All
TfL» 's stations do look very similar, until you see the colour of their roundels. But it is
DLR▸ - though it was the road outside it that got flooded. The tracks for DLR, GE main line, and Crossrail are all together and go over the Pudding Mill River (and the Northern Outlfall Sewer) on bridges. I don't think the water rose that far! And note that the Crossrail eastern portal is up at overbridge level - I think it's there for a reason.