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The reason for the rust is the way the drain from the A-pillar/cowl area is routed to exit at the large-ish hole in the floor immediately behind the front tire.
The problem is: the control arm structure isn't isolated from the drain - it's all part of the same cavity that water can get into from up top (A-pillar) and below (spray from the tire --plus road salt -- into the drain hole at the bottom).
Paint alone won't solve this, unless you're confident you can make a 100% barrier on all sides that will never break down. After you rebuild the area, you need to prevent more rust by regularly oiling inside the cavity including the control arm area.
Also, with that much rust on the control arm mount, you probably also have rust in the floor, inside the two longitudinal "frame" members that run backward from the control arm area.
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