Most of Russian aerodynamic advancement occurs during Soviet Era. After that , everything collapse. Many Scientist left since no project. I doubt they have continue any research into the nineties. Look at PAKFA shaping, hardly any modern with too much angle exposed , and non in line with proper stealth. If they has such advance study design and experience. T-50 with not has such shaping outcome. Mind you, that suppose to be a top of line Russia 5th fighter. All the best resource from Russia Are pool together. It suppose to represent the best of Russia aerodynamic, research and study.
Those blog reports are taken with a pinch of salt. But I do believe J-10 do receive some assist since it occurs in the mid/late 90s. Chinese is still very weak during that time. But After that experience, I believe China can stand on her own after the mid 2000.
Not to mention China has even more bigger , newer and better facilities for example the new Sichuan huge wind tunnel completed in 2009. Not to mention china far superior supercomputer will aid in further aerodynamic study compare to Russia.