The Short Version
The claim exaggerates a real but narrow trend. While coal capacity has expanded in India and parts of Southeast Asia due to economic and reliability concerns, 87–92% of new coal capacity is concentrated in just China and India — not broadly across "many" developing nations. Moreover, coal power actually fell in both countries in 2025 for the first time in 52 years, and renewables overtook coal globally. Most developing nations are not increasingly choosing coal over renewables; the dominant trajectory is toward clean energy.