I watched the live stream, first 1.5 hour is on carrier catapult history, PLAN history with catapults is in the last hour.
There were two points that were pretty interesting:
1. Acquiring HMAS Melbourne and its BS4 steam catapult was actually quite the unexpected windfall for PLAN, the BS4 was studied in detail and had the two earlier attempts at building carrier not being cancelled they may have been equipped with BS4 clones or derived steam catapults. Shilao showed off an internal manual (he double checked to make sure the book had a RRP, otherwise he wouldn't have been able to show this manual on air) from his collection with a section on workings of BS4:
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At the time it would seem neither RAN nor UK or US thought China would go onto develop carriers and so didn't bother to remove the catapults from HMAS Melbourne. If something like the sale happened today they wouldn't make that mistake.
2. While reading through the last few pages with people saying Fujian's EM cats are powered by supercapacitors I recall having seen somewhere that that's not actually the case, and that Fujian's EM cats are in fact powered by flywheels too. In fact I recall somewhere on Weibo someone had a pretty
official looking table listing the pros and cons between flywheel vs supercapacitors and it wasn't clear cut that supercapacitors are better. The team did specify in the stream that Fujian uses flywheels for the EM cats.