Dmitri has withdrawn from active involvement in socionics since he became a court translator. In his site he was clearly critical - even dismissive - of Reinin dichotomies, including an interview with Grigori Reinin himself.
Regarding the +/- concept, he actually posted here on the forum about how he thought that the concept added nothing of importance. Which according to Rick is the view of "mainstream" socionics in Russia/Ukraine.
Now, obviously, "Russians" is far, far more than just Lytov or even Gulenko.