Curiously, while Cute Orca is rather cautious/reserved on his views on the Chinese military aircraft engines, he's unusually optimistic (or based on my viewpoint) regarding this:
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Do NOTE the bolded and underlined phrase "my personal guess" (个人猜测).
Perhaps the registration number we saw on the J-36 during its first flight (36011 instead of 36001) could be indicative of the aircraft being a more advanced demonstrator/prototype than previous expectations, which may have been a factor in such a deduction.
Though, I think I'd be more inclined to believe that the J-36 would join the test and evaluation squadron/brigade by 2029/2030, and combat squadron/brigades by 2031/2032.
As a side note: The J-XDS wouldn't be far off the J-36, IMHO. The carrier-based variant might add 2-5 years, unless it is also developed and tested concurrently with the land-based counterpart.
That's definitely more aggressive than I would've expected, but J-36 did fly with something closer to the final design than when J-20 first flew.
I do think there is a difference between entering service vs developing full combat capabilities though. Many of the things that I've been hoping to see on J-36 like controlling UCAVs and becoming a major EW platform are things that take more years to fully develop and likely not reaching "FOC" until much later.