This is basically common knowledge now. CSIRO report pointed to similar conclusions for several years, at least since 2021 when I started to notice.
What is relevant to real life (since Australia probably never will get nukes) is that even assignning system costs only onto VRE, they are still almost the same LCoE in a 90% VRE system. This is again consistent with previous reports.
After Australia pass 100% VRE, exporting green hydrogen in the regional market will probably handle the last remaining flexibility needs. Exporting electricity directly to SE Asia is less likely but still a possibility.
What surprised me was how little solar had been in Portugal and Spain. Most renewable growth had been wind. But that has been drastically changing in very recent years. This is a good thing in terms of citizen participation and cooperative ownerships, since solar is the easiest technology for ordinary people to possess and fully control. In terms of tech level, unless compared with diy small hydro or wind turbine, it is also the simplest among all the options for people who are not trying to build everything from scratch.