you can build document versioning into a blockchain-backed protocol - I would assume that Digibuild have done this as documents can be both corrected and extended over time. The important factor being that the old version is not erased and thus you can see the history of the document, which could be beneficial.
By uploading said information you are claiming it is true. Whether other people believe it to be true depends on whether they trust you or otherwise have verified for themselves (which can also be asserted cryptographically).
No digital technology can solve epistemology and tell you what is true - but that's not the point, and blockchain applications are not unique in this.
I think a lot of companies, when talking about blockchain technology, really mean a merkle tree - distributed or not, with proof of stake/work or not. The whole point being to cryptographically prove things like chain of custody, who is asserting what facts etc. The benefit to such tools is transparency, which helps in low-trust environments.
I'm pretty sceptical of blockchain applications in general because it became one of the word examples of a technobabble buzzword, but in this case I can see the argument for it.
How do you ensure parity between the real world and the Blockchain?