tbh im not super familiar on Chinese SAM's, but generally when it comes to VHF radars, you can detect an inbound VLO asset, but the resolution would be very coarse. Their longer wavelength gives them an easier time in detection, but at the cost of tracking accuracy and resolution. In practice, its more of an early warning tool, used to cue other sensors and or effectors.
With the longer wavelength, you have a far broader beam, like just a silly example but a 3m antenna at 100mhz may have a beam width of 8 degrees, vs an X band aperture would have a sub 1 degree beam width- just an example.
You also cant have full broadband stealth right, youll likely make tradeoffs against VHF band by improving X and S band stealth characteristics as most fire control radars will operat ein these bands. So JY27 etc all exploit this, giving u detection at reasonable ranges, however, those large beam widths cant give u the 'tight' lock llike an x band or s band radar can, meaning you can have multiple hundred meter inaccuracies, really dropping ur pK down hard.