I don't believe in myths, legends and tales of the Cold War. What I believe in, is what is documented and what I see
What I see, as demonstrated in the videos you posted and other media, they don't lack modern equipment. What I've also seen since 2015 is that they receive training from some of the most reputable units in the world, like SEALS etc.
Sorry, but Ukrainian SOF have not been in better shape and state as they are nowadays. That myth of *Soviet spetsnaz* is what it is.
What you also see btw, and what basicaly summs it all up, is that the Russian Federation armed forces have virtualy adopted much of the US doctrines in that regard, Joint Vision plans and equipment, their Special Operations Command is basicaly an analogue. See how they look and see how they operate. That's an upgrade and see how well it works out for them in Syria.