Merely having Chinese-made SA-7s (or any Chinese-made weapons or ammo) is not prima facie evidence that China gave or sold them directly to them.
Any more than Glock "armed" the LAX shooter. SA-7s are cheap, everywhere, and can be bought easily from any shady middleman arms dealer or pretty much any country, anywhere in Central Asia.
And color me dubious of any of the military or intelligence reporting of the Washington Times. Just too full of errors, distortions, and hype.