Yeah it has to be. Warriors are 1000 soldiers and would show as 200 point increase (However, two civs may have both completed a warrior coincidentally, though i bet those paths will be wrong if we can trace the worker/food numbers of all civs
2000 soldiers – Sailing, Hunting, Mining, Animal Husbandry
4000 soldiers- Wheel, Alphabet, Astronomy, Metal Casting, Compass, Construction, Steel, Radio, Satellites
5000 soldiers- Composites, Stealth
6000 soldiers- Mathematics, Chemistry, Combustion, Archery
8000 soldiers- Guilds, Fission, Flight, Bronze Working, Machinery, Assembly Line
10000 soldiers- Horseback Riding, Iron Working, Artillery, Industrialism, Rocketry, Advanced Flight, Laser
12000 soldiers- Gunpowder, Rifling, Military Science