Indeed, they can! However, can they crank up defense production as quickly and substantially? That’s what I’d like to see, and particularly, right now, in ICBM production.
There are several levels to answer that questions, some of which require classified information that we don't have access to, but many you can make some educated guess based on open sources. At the highest level, we can look at the barriers, bottlenecks and capacity to scale the production for different categories of armaments and platforms.
Strategic weapons - There are no technology barriers. DF-41/DF-31AG are ready and deployed; JL3 has been successfully tested and is likely close to deployment (pending on 096). Silo expansion and construction have been clearly on-going for a few years now. Weapon grade materials at least are enough for additional 1,000 war heads if not more initially. I would give it 5-10 years to substantially enlarge the strategic forces (x2, x3, x4 or more).
Navy - I posted some credible rumors last years about the 14th Five-Year plan, which include 8 075 (total), 8 055, 20 054A, and more 071, 052D. For carriers, we can all see where 003 is and I expect we'll be seeing another 003 class carrier emerging in the next few years. SSN & SSBN are most difficult to know since it's hard to get any public information unlike surface warships, but from the bits and pieces that have leaked over the years, it appears that 2025 would be the year 095 and/or 096 would either be launched or even commissioned. I expect the surface fleet will be significantly expanded in the first half of the decade, while the more strategic part of the fleet (carriers and nuclear submarines) will be meaningfully expanded in the second half of the decade. The issues with QC-70, the gas turbine engine for Type 726 LCAC, have been resolved and Type 726s are ready for volume production, which are clearly very important for the Taiwan contingency.
Air Force - The biggest barriers for PLAAF over the years have been engines, of all types. But that barriers are essentially no more, at least for the current generation aircraft. WS-10s are mature and stable; its various variants have become the default engines for all PLAAF primary aircraft: J-10C, J-16, J-20 and soon Y-20. Z-20, which will be the main helicopters for all branches of PLA, has the indigenous engine WZ-10 and have been in volume production. Both WS-15 and WS-19 are progressing well, particularly if you compare them with what WS-10 has gone through. Since WS-10B's thrust is close to 15 tons, the urgency for WS-15 is less now. WS-15 will likely to be ready by 2025, with a thrust that is significantly larger than the original goal (15-16 tons), likely above 18 tons. J-15T will be ready and we may have at least a squadron to be in service by 2025. J-31 will be commissioned around 2025 and have meaningful numbers in service in the second half of the decade. All told, I expect total 300 J-20s, 600 J-16s, and 500 J-10Cs around 2027, the centenary of PLA which Xi Jinping specifically set as a milestone for PLA and it was written into the formal party document.
Missiles - Mainly short-, medium- and intermediate-range conventional missiles of all kinds: ballistic, cruise and hyper-sonic. Hyper-sonic missiles will be the main developments here. We've already seen DF-17 and DF-100. We may see the expansion of the inventory and also new types, for example DF-27 and DF-37. There are no or manageable technology barriers, since China has already achieved the breakthroughs. No major issues for scaled production either.
As I said elsewhere at SDF, we will see a burst of all the major strategic platforms and big-ticket items for PLA in the coming decade. The exact production will be determined by the perceived threat level and the political will. There are essentially no major barriers or constraints in technology, finance or capacity. Not any more.