They are nowhere even near to having spent as much as the Russians in resources. You forget that the economy of the USSR was a massive powerhouse, that allocated absolutely massive incestments in military technology.

The Chinese, on the other hand, acrually aren't incesting as much money on these technologies as one would think. The only company (SOE) that has any stake in jet engines is Shenyang, and despite also making whole aircraft, drones and so on, they have 15 000 employees for the whole operation.

Comparatively, Pratt and Whitney, which does only engines and nothing else, and is one of four companies capable of making modern turbofan engines, has more than twice the employees as Shenyang, which designs and manufactures multiple different aircraft. Boeing has ten times as many employees as Shenyang.

As far as outinvesting the Russians, we can compare again the number of employees. The most advanced Russian engines are produced by UEC Saturn, which only makes engines, and by itself has 21 000 employees.

That's again more than Shenyang, which doesn't only make engines.

So no, it's patently false that the Chinese are deploying more resources with less results.