Deadeye says spend a focus instead of a target lock but to fire Homing Missiles it doesn't require you to spend a target lock.

Does Deadeye still work?

Yes, it does work. Normally you would need a target lock, but it doesn't get spent to fire the missiles. With Deadeye, all you need is a focus token instead, and again, it doesn't get spent to fire the missiles, so you can use it to modify if you need to.

Yes.

Deadeye also says you can treat "Attack (Target Lock):" as "Attack (Focus):".

Deadeye says spend a focus instead of a target lock

Deadeye doesn't say that though - not exactly.

what it says is:

You may treat the "Attack [Target Lock]" header as "Attack [Focus]". When an attack instructs you to spend a target lock, you may spend a focus token instead.

So it contains 2 instructions - the first instruction on the card answers the question

its also a 2part card.

First part says you may treat TL headers as Focus. Check

Second part says you may discard a focus instead of a TL. Doesnt apply, but the header is already changed to Attack: Focus so it doesnt matter.

Almost every card with a noticeable break in the words doesnt have to have EVERY condition to trigger. Heck, R7-T1 doesnt even have a break and he doesnt need to take the TL to boost, just check range (even though the wording sounds like it is in a specific order)

its also a 2part card.

First part says you may treat TL headers as Focus. Check

Second part says you may discard a focus instead of a TL. Doesnt apply, but the header is already changed to Attack: Focus so it doesnt matter.

Almost every card with a noticeable break in the words doesnt have to have EVERY condition to trigger. Heck, R7-T1 doesnt even have a break and he doesnt need to take the TL to boost, just check range (even though the wording sounds like it is in a specific order)

It simply lets the Devs have some space for future ordnance, like having Attack[Target lock] that requires you to spend a focus token.

You must maintain TL and spend a focus to fire.

That way the devs don't step on their own throat in teh future.

That way the card changes to Attack[Focus] but it never instructed you to discard anything, so you don't.