Well, these latest rumours would seem to support my long held belief that the Su35 deal was mostly political.
It is a 'gift' the Chinese government agreed to give to help out Russia, with little real enthusiasm from the PLAAF.
Worse, it seems the Russians might be pushing their luck too far by trying to pass off sub-standard monkey models as the real thing, which is giving PLAAF an excuse to threaten to kill a deal they never really wanted.
Realistically, I think the PLAAF will only find full spec Su35s acceptable, as at least that gives them a true benchmark of what state-of-the-art Russian weapons can do to measure their own domestic systems against.
In which case those 24 Su35s will make a perfect dedicated aggressor regiment, that can double up as enforcers if the PLAAF wants to show some teeth to the likes of Japan, since they could happily light up Japanese fighters with the Su35s' radars ( as Japanese F15s have already done to Chinese fighters) without worrying about giving away operationally useful wartime frequencies.
Failing that, I think the PLAAF will want to gut the deal and take the Su35s without radar or avionics (at a fraction of the price) and just put in all Chinese systems after they have been delivered to use them to make up numbers of their Flanker fleet.
If the Russians don't agree to either option, and the PLAAF can cite sub-par performance as a result of deliberate downgrading, that will pissing the Chinese leadership off enough that they will feel any diplomatic fallout to cancelling the deal will be worth it to remind the Russians not to try and take advantage of Chinese generosity.