Sure, but you're missing the point which people familiar with spacecraft systems engineering are actually making, which isn't "radiators are a problem because they're hard to design" but that "radiators are a problem because it's hard to design everything else to offset their relatively large mass budget, and thus every other aspect of designing and operating an ODC as a profitable alternative to terrestrial ODCs is coupled to the theoretical limits to how low the radiator launch mass can be". The number of engineers required to design radiators themselves is totally irrelevant, but you can't isolate the radiators' required launch mass from the overall concept of operations and operating economics.
The satellites built by SpaceX so far, and their engines, are quite unlike most previous space engineering due to these reasons. Given the undeniable success they've had in building Starlink, with each version growing considerable in size, I just don't see which engineers would be able to fully rule out the math that SpaceX might be working on here, exactly because there are so many parts of the total equation and where SpaceX are moving outside the previous design envelopes in many dimensions.
Of course I'm personally not convinced or able to know whether this is economically sensible - I just believe it's very difficult to fully rule out given the track record of SpaceX - and given that there doesn't appear to be any singular insurmountable thing that needs to be figured out here. Hence why I said in my original post that this is why I'm excited to see the design space explored.