From that picture I would say the HRT probably does have some sort of step? I might be wrong, and the nose is low, but I think there's probably a step just behind the antenna you can see sticking out. Perhaps it is just a straight line up to the chassis as opposed to a step though.
If I was a McLaren engineer I might be a bit worried by having a different philosophy to Red Bull, Ferrari, Mercedes and Lotus but I certainly wouldn't give a shit about what HRT have done, if you excuse my french.