He said that it didn't look like 4.5 but he wasn't sure. So until we have some official confirmation, it could be either size. Why couldn't those leaked pics of the Bionic be next to a Droid X so we could tell?!
Your right. I found that after I went back and read it.
Also this quote in that thread. To me this is probably where the idea of 4.5" came from:
"It is 4.3". The reason why people thought it was 4.5" is because it was next to a Defy and it was originally said that it was next to Atrix which is 4". So the reason why it looked so large in the photos is because it was next to a Defy which is 3.7"
Otherwise I guess none of us know for sure.