Not completely redundant. I use the same mod (among others) and I often find corvettes to be the most survivable ships in my fleet, simply due to their evasion.
I once went up against a 2 million fleet power awakened FE in 1.32, with a million plus doom stack of my own, including literally dozens of super heavy capital ships. The only thing to survive (and ultimately win) the battle were the 300 or 400 hundred torpedo boat corvettes I brought along. All the expensive flagships, dreadnaughts, and battleships were wiped out by their titans' lasers fairly early on.
Sure they are not completely useless, they are immensly functional and they are the last ships to be targetted mostly.
Can't do conclusion on Limited number of controlled simulation, I think you need at least 1000 samples to make a definitive conclusion.
Though I did have a Battle in MP, where the two sides was basically this:
My side: 6 battleships, 30 Cruisers, 80 destroyers, 350+ Corvettes (50% torpedo)
Other side: 20 battleships, 40 cruisers, 60 destroyers, 120 Corvettes
The end result was loss of my side, the opponent had no Corvettes left but still had about 8 battleships. At the end of the Battle sure I only had my Corvettes left due to their evasion but even their torpedo varients were unable to deal enough damage to the battleships to win even when it was Down to 100+ Corvettes vs 10 battleships. This doesn't mean this is true for every game, but I will not be buiding such imbalanced fleet composition with focus on Corvettes. In the release Version of Stellaris I wrecked an opponent who had 40+ battleships With my 800+ Corvettes and I won easy, but that doesn't seem to be the case now. Still integral but not overpowered.