Stealth combined with their TMM combined with the relatively high armor points. With six points armor and two points structure, you're looking at a DIR of 14 base and a multiplier of 1.4 (+0.2 for TMM, + 0.2 for STL), which rounds to 20 PV just for the defensive side of things. ECM, PRB, and RCN combine for another 5 PV (2 for ECM, 2 for RCN, 1 for PRB). That's 25 PV before even looking at the guns, or including SZ or regular MV into the equation. Guns are 12 PV (IF0* adds 1), SZ is 1, and MV is 1.5
Add it all up for... 40? I must be missing a rounding point somewhere, but STL is a significant points premium. Maybe IF0* doesn't actually cost anything.
Offensive: 13.5 (14.5?)
Guns: 11 (3 + 6 + 2)
SZ: 1
MV: 1.5 (0.25 * 6)
Specials: IF0* (1?)
Defensive: 20
DIR: 19.6 -> 20. (12 for armor, 2 for structure, multiplied by 1.0 plus 0.2 (speed) plus 0.2 (STL))
Specials: 5 (ECM, PRB, RCN)
Total: 38.5 (39.5?)
Given its effect on the battlefield, STL should probably be +0.15 instead of +0.2 on the DIR, but that's not really an egregious difference.