The package controls what is on the ship, not how much it costs.
The whole ship price is one price, plus any equipment.
Yes, the line "addon = shield01_mark08_hf, HpShield01, 1" is the shield. If you delete that line the price will drop by the shields price.
Or to change the price of the shield, you would have to find its price in the correct ini, maybe marketgoods? I'm not really sure, I haven't looked in their in a very long time.
Also the scanner "addon = ge_s_scanner_02, internal, 1" might be adding a price. It depends though if you are running a mod or not in the files.
Hmm, where have I come? Why does it seem so familiar to this one?