International Standard for disc hubs -
So, you're talking about a maximum permitted deviation from the nominal 10.16mm of +/- 0.1mm (.004"), exactly the thickness of a Coke can.
For a manufacturer (Hope or otherwise) to be able to claim that there "is a problem with certain hubs" would indicate , to me at least, that they have found some hubs where the flange offset falls below the permitted minimum of 10.06mm.
Or that they have failed to take all possible fork dimensions (not just the actual caliper mount) into account when designing their brake components and are using the "problem hubs" statement as a way of passing the responsibility on to the end user....
Or it is also possible that the fork may fall outside of tolerance, of course.
The only way to ascertain where the error lies is to get your (or someone else's) measuring gear out and check the hub. Otherwise we'll be speculating for ever
And anyway, we want to know