Ah yes you're absolutely right, it's a modded research.txt but I didn't realize that particular thing wasn't in the base game. The two "abilities" lines do work in-game. In case it's helpful, I'll put it here, it's from Research Unleashed (and also present originally in the AI Improvement Mod). Maybe it could condense them into one line? Although not sure if that's worth the coding effort.
PROJECT ;106, Enhanced Construction, 2, 32, 1, 3, 0, 0.0,
ABILITIES ;Resupply Ships, 3, 3, 0, 1
ABILITIES ;Increased Construction Size, 2, 2, 400, 0
PARENTS ;105, N