Yes, that's correct for the update.zip file, which is an ota update.I updated to B132 in preparation for B510 ( from B125) and I must say, 132 is definitely smoother than 125...
When extracting the B510.zip I see that the actual UPDATE. APP file is only 15mb with a bunch of other folders etc. Both 125 and 132 was only on big UPDATE. APP file. Is this correct?
A full update.app is around 1,2gb when it's unzipped.
I'd suggest using the full update.app from the Huawei Romania. I've posted a link to the file (on Mega) a few posts up.