Was looking at using Stealth Device and Delta-7B upgrades on a Delta 7 Aethersprite. Does the point cost of Stealth Device come strictly from the printed value on the pilot card? Or would the -1 green die from the Delta-7B configuration reduce the cost of Stealth Device?

My guess is that it is based off of the printed value on the pilot card which seems to be confirmed by the official squad builder.

It is based on the printed value on the card. Quoted from the rules reference

Quote

Q: If a ship equips an upgrade that alters one of its values (such as agility), how does this affect variable cost upgrades?

A: Other upgrades are ignored when calculating variable costs, and the base values of the ship are used.

Rules Reference 1.0.2 "FAQ: List Building"

Cool, thanks