no, its not every gun maker.
while its wrong of them do deny any guns to be registered (they shouldnt even have to be registered), i don't see a lot of major brands on there:
-glock
-sig (they said mosquito only)
-S&W (only spur trigger models
-Ruger
-springfield
-Kimber
-Walter (P22)
-Beretta
although its complete BS these restrictions, its still a tremendous improvement over no guns at all
probably 99% of police agencies use Sigs, Berettas, SWs, Kimber/Springfields, or Glcoks, so, no, the chance of a Chicago cop having a duty arm on that list is unlikely.