The -100% pirate leader generation may do absolutly nothing, as pirates appear to get their leader appearance chance from the same stat as national leaders.
Aside from that, the race is somewhat weak. -30% military and civilian shipsize is absolutly punishing, the disallowed technology and government is also strange. The racial advantages mostly effect stats that have less of an impact on the game. The 10% growth rate means the migration bonus is kind of useless. Maybe this race's troops are useful, but you did not list the troop strength. Assuming this race has strong troops, they might make nice troops but you would not want to play them if all you want is troops.
Unless your goal was to make this race deliberately weak/difficult.
Overall, the Gizureans will probably outmatch this race in the selected niche. They have -40% ship maintenance so they can swarm a lot better, they lack the penalties, they have extremely high growth which lets them spread everywhere, and they have -100% leader chance (which applies to both pirates and nonpirates), and finally they have a very powerful starting character. The only advantage your race has is troops, and if Gizureans can annex a planet that has its dominant race as one of the troop races, then it will be able to field strong troops as well.
I ate the batter of the bulge at Hans' Haus of Luftwaffles