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I get that forwarned allows a farseer to allow a unit within 6" to fire on any unit arriving via deepstrike. Does a disembarked unit count as deepstriking in this case?

RAW answer : A disembarking unit is set up mid turn, therefore they are reinforcements, as defined in the core rules. They can be targeted by forewarned.

Player friendly answer : There is a FAQ which says that you can't target a disembarking unit from a droppod with auspex scan, therefore disembarking units aren't reinforcements, and can't be targeted by forewarned.

Now pick whatever answer you like better

You cannot target disembarking unita with Forewarned. There’s an FAQ saying as much.

Ignore any soapboxing above and boil it down to just this.

The answer is a definitive no per the main rulebook FAQ:

Q. Some rules – such as Early Warning Override in Codex: T’au Empire, the Ever Vigilant Stratagem in Codex: Adeptus Custodes, and the Auspex Scan Stratagem in Codex: Space Marines – allow units to shoot at enemy units that have just arrived on the battle eld as reinforcements, as if it were the Shooting phase.
Q1. If the unit arriving as reinforcements is a Character, can the ring unit shoot at it even if it is not the closest enemy unit?
A: No – unless the firing unit is using a weapon that allows them to target a Character even if it is not the closest enemy unit. This takes place ‘as if it were the Shooting phase’, so all the normal restrictions of the Shooting phase still apply.
Q2. If the unit arriving as reinforcements has another unit embarked inside it which must disembark after it has been set up (such as units embarked within a Drop Pod, or a Tyrannocyte), can the firing unit shoot at the unit as it disembarks?
A: No – though the unit can shoot at the Drop Pod/ Tyrannocyte before the units inside disembark.