which is great, but as i understand it will still lead to an overall decline in share of nuclear power. The scale of their power production is unfathomable
No, almost every one is above 1GW - divide the net capacity by the number under construction to see the power [1]. They appear to be almost all CAP1400 (1.4GW), Hualong One (1.0GW), or CAP1000 (1.0GW). I see a single Linglong 1 (100MW) under construction. Proposed are all above 1GW.
[1] https://www.eia.gov/todayinenergy/detail.php?id=67746