Per the source that was shared below, all it says is that they had to take the photograph later than the flag was put up because it was night time when the actual flag went up. Having to take the picture two days later than the actual event doesn't make it "fake". The victory that this image is depicting still happened.
I was wondering why I hadn't ever seen it!
https://en.wikipedia.org/wiki/Raising_a_Flag_over_the_Reichstag
Oh wow! Thanks for posting, I was clearly clueless ?
I hadn't seen it before either. I just did some googling on it.
Per the source that was shared below, all it says is that they had to take the photograph later than the flag was put up because it was night time when the actual flag went up. Having to take the picture two days later than the actual event doesn't make it "fake". The victory that this image is depicting still happened.