Peraion Graufalke
First Post
If you check out the original printed source, neither the Paragon Thief nor the Epic Thief have any options for utility powers at any level 11-30. It's hard-wired into the builds.
Compare the chart for Thief (HotFL 174) where levels 2, 6, and 10 all read "utility power" to the Paragon Thief & Epic Thief charts (p. 186 & 189) which instead list the names of the specific utility powers gained.
So, the CB is correctly applying the lack of choices by RAW, because a Paragon Thief does not get a choice of utility power at level 16.
At the risk of repeating myself: check the "Other Sources" entry on page 57 of HoFL. It's legal to select powers of the same class, level, and type from other sources, and the new CB is wrong.