I think I pointed out your analysis is extremely flawed and it makes absolutely no statistical sense to add win rate vs time curves of 2 different civs even if their tech trees are approximately the same. Its more similar to econometrics and not elementary school math. And in this case, the civs aren’t even close to being the same. Slavs having a significantly diverse tech tree with great cavalry, mid game map expansion bonus with their UT, extra bonus on monks that otherwise have most of the important upgrades. So that misassumption of yours is completely invalid.
Second thing if you give double eco bonus to a civ its going to be faster and play out similar to a civ of approximately the same level of eco bonus, similar military tech tree. Closest to Dravidians after they get a food economy bonus like that is Vikings. But even they are much different because they do get knights with +2 armor in castle age but don’t get gunpowder or halbs in imp. So effectively you can’t compare Dravidians with any of the civs because of their awful tech tree and a long term food eco bonus would help them get to a point where their units suddenly seem quite good and usable…
If you have a civ with a set of units that can do well if somehow the player landed there but are unable to get there, you need to provide a good powerful mobile military unit like Mongol having lancers or a very strong economy to race ahead to get to that like Poles or Burgundians or huge military discount like Incas. Whenever a civ is buffed this way significantly, units that seemed normal or average will seem very strong, units that were underwhelming will seem usable. Remember how much people complained about Gurjara and Hindustani units and now nobody does. Likewise nobody bothered to play Malians but now they’re one of the most picked.
The same will become the effect with Dravidian units. With the farm bonus and 200 wood, they’ll match the timings of fastest civs like Mongols or Malay. Get tcs and monastery to get far ahead in economy or use the powerful food eco to go for 1 tc, infantry play. A mid game urumi transition might seem quite possible because they can use the villager lead with early tc addition to get stone and drop a defensive castle similar to OG Poles. Or simply boom fully and extensively to Elite elephant archers while getting sufficient map with guard towers or castles. The double eco bonus will support it.
The threshold number of urumi swordsmen you have mentioned will become viable for most of the players. And it won’t be just Viper masterpiecing against Matador. Once upon a time Khmer were a Viper masterpiece exclusive civ but now everyone is able to use them. Reason being the double eco bonus. Save the early wood from buildings and use the farm bonus for very fast uptimes. Lot of flexibility.