That's correct. There was no "build" of Windows 7 after Service Pack 1.
For Windows XP, Vista, and Windows 7, Microsoft used "service packs" for major updates Starting with Windows 10, Microsoft used the "build" terminology instead.
You might want to read this article: https://www.howtogeek.com/235953/how-windows-10s-builds-are-different-from-service-packs/
I suspect that your "seniors" want you to install all of the updates to Windows 7. If you need to do that, you will have to do some of that manually before Windows Update will work. It's been a while since I was familiar with the details and the links I have are outdated and no longer work, so when (not if) you run into problems updating Windows 7, please ask a new question including the pertinent details, including error messages.