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1. Does have the Eldar Firestorm 2xAT5+ and 2xAA4+ shots or just one each?
The doubt is because in the list it starts with 2xAP5+/AT5+/AA4+.
Two of each.
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2.Can you use the Supreme Comander ability even if the formation where the unit belongs is broken?
Yes. As long as the SC is on the table (not in reserve inside a Gate or an Aircraft/Spacecraft off-board) then his re-roll may be used.
If he is in reserve, then his re-roll may only be used if it is an activation that directly affects him (His spacecraft/aircraft or his formation trying to use a Gate).