Kinda true really?
DB used whatever they had as a bit of a surplus to get the cheapest quotation for supplying a gap in the Oliver line-up?
Maybe not all the reality of the situation, but could explain why DB supplied Oliver, just like the Fiat derivatives and later the Japanese influence. Oliver/White were looking for the cheapest line-fillers they could source?
Question that might arise is: Would DB have found time to supply Oliver, if their own order books with British farmers was rammed full?