To be honest if it truly is the export variant this is rather shocking news to me, I expected that the J-35 wouldn't be exported until after 2040. I expected it to go like the J-10 where the plane wasn't exported until 18 years after it was commissioned.
The circumstances are vastly different today compared to the J10’s time.
The J10 was China’s first, one and only truly competitive indigenous fighter. Back then, China’s aviation industry was also still in its infancy, so there was no real viable alternative to the radar and avionics suit that the PLAAF uses which would be used on the export variant. So of course the PLA was massively cagey about exporting it, as they didn’t have anything better coming just over the horizon, and there was a genuine risk that opfor could glean operationally relevant information about the capabilities and vulnerabilities of the PLAAF’s own J10s radar and avionics suits by studying export variants.
Today, not only is the J20 operationally deployed in vast numbers, there are two manned 6th gen programmes both with flying prototypes.
On top of the myriad of UCAV designs, you also have a vast and highly competitive domestic aviation industry with multiple vendors offering competitive full avionics suits.
All the PLA would need to do is ban the export of the variant they use for export, and any tailored counters to the export variants will have minimal relevance against the version the PLA itself uses.
Chinese industry also has vastly greater experience with export variants, and so can offer the PLA far greater assurances that exports will not compromise domestic versions.
Allowing the J35 for export is a must to remain competitive and present a viable alternative to America on the world stage. Big exports of the type would also allow SAC to ramp up production capacities, which would ultimately benefit the PLA if it wants to ramp up output numbers in the future.
Finally, having a big export market will also help to directly support the vibrant Chinese domestic aviation industry by allowing second best radar and avionics makers to secure big contracts to give them more capital for R&D and production capacity expansion to keep the current top dogs on their toes as the increased competition is how the PLA ensures it always gets the best equipment in the future.