Can clearly see from empty perimeter in the heat map PRC fishing largely stays clear of SKR, JP EEZ. Reason DC thinktank "report" try to play up 12m hours in SKR is likely that hotspot just south of SKR peninsula, aka disputed Socotra rock EEZ. And I surmise majority of JP 1.5m "hours" are over disputed Senkaku EEZ. 4.5m TW hours, obviously PRC considers TW waters part of her territorial/EEZ waters. About another 1m hours from SCS EEZ disputes. AKA 18/21m hours are basically DC think tank doing customary China bad funny stats from disputed maritime delimitations. Incidentally using said delimitations to extrapolate 3000k PRC distant fishing fleet into 30k+ in 5 years... somehow.
PRC has largest absolute DWF fleet size, but per capita she's underfishing, especially relative to TW, SKR, JP, who're at only 30-50% aquaculture. Spain and Russia also up there. Also fraction of SKR/TW subsidies per capita, about on par with JP. Of course you don't see DC thinktanks hitpieces telling these actors to kill their DWF fishing industries. For PRC's DWF fleet to match other top DWF fleet's capita fishing efforts, she would have to fish something like 3-9x+ more. Unless one thinks PRC fishermen and citizens shouldn't have the same opportunities or access to seafood. Ecuador & Peru, two countries with ~1/30th population of China, together captures about about ~1/2 of China, who also has 1/2 the EEZ of these countries, which incidentally means China has to fish more in international waters.
The only reason PRC IUU fishing got media play / propaganda push in the last few years is US wanted to beef up influence of pacific nations playing up PRC IUU fishing so they can drive the issue to forward deploy coast guard and build influence. It's geopolitical lawfare, and it's unlikely to do anything substantive because any agreement by PRC on curtailing distant fishing would be on per capita basis which would first involve everyone else (JP,SKR,TW etc) to essentially kill their entire DWF industry before PRC would even need to make any cuts.
Again, let's stress how absolutely batshit stupid these new numbers are:
SKR, ~500-700 DWF fleet, 300-400k metric tons per year.
JP ~1200-1500 DWF fleet, 600-900k metric tons per year.
TW ~1000 DWF fleet, 400-600k metric tons per year.
AVG 400-800 tons per ship.
PRC... 32000 DWF fleet, 3000k metric tons per year.
AVG 90 tons per ship.
Or... avg 400-800 tons per ship
PRC ~3750-7500 DWF fleet
PRC official report is like ~2700 in ~2020, add 25% for 25% by 2025 increase catch and you get ~3400. It's underestimation (and while PRC wanted to cap to 3000 in last 5 year plan), but it's underestimate by 100s, not over estimation by 10000s. Like tag on highest maritime militia estimates of ~10k, and it's still almost ~20k over.
E: or just look at estimates of global seafood market growth... ~5% CAGR, ~+50B over past 5 years. Like 35B of that from PRC aquaculture growth. What's the 29000 new DWF doing? Global DWF size for major fishing nations is like 6000... so PRC adds... 500% that and somehow global fishing market grows by... 30%. US thinktank innumeracy.