It's because they are estimating new offers given out today. It's understood that people with a few years' tenure could be making a lot more due to stock appreciation, but if you are in the job market today that data point is useless and only messes up the expectations.
Are you certain? I imagine if you get an offer, and they really want somebody at your level, they'd have to beat or at least match the TC unless it is Fuchsia or some other hot rod project.
