By the mid-50s his history had been all washed over and forgotten, and it wasn't until the 90s that the issue was broached again.
There is no reason for the coverup to continue today or for anybody to still believe it - there is a lot of testimony about Von Braun overseeing hangings and the deaths of thousands of slave workers. Had he not been useful for other purposes it is almost certain that he would have hung at Nuremberg.
[0] https://www.amazon.com/Apollo-Race-Moon-Charles-Murray/dp/06...
[1] https://www.amazon.com/Red-Moon-Rising-Sputnik-Rivalries/dp/...
https://www.amazon.com/Apollo-Race-Moon-Charles-Murray/dp/06...
I have the book! While it's a worthy book and I enjoyed reading it, it is not written by an engineer or scientist and comes from a lay perspective. There are a few great tidbits in it, like how to determine the amount of fuel left in a tank at 0 gee, but you had to read a lot of pages to find those nuggets.