Chinese military tech has always been and will always be decades behind. Autocratic regimes are terrible at fostering innovation - and unlike with civilian tech, China cannot make use of cooperation with Western companies in order to catch up. Their only remaining option is subterfuge, which has limited effectiveness.
Additionally, the Chinese military lacks institutional knowledge and experience - and courting Western experts won’t make up for this. They haven’t fought in any serious war since the 1970s. Against pirates and sandal fighters in and around Africa, they are performing shockingly poorly. On top of that, there’s corruption that is at least as bad as in Russia, poor quality equipment, low training standards, awful electronic warfare capabilities, etc. pp.
Unsurprisingly, defenders of dictatorships always have to resort to whataboutism to defend the indefensible.
As per usual, this whataboutism is lazy and inaccurate as well.