I'm not sure how accurate this is. Eastern Block countries are notorious for androgens and rarely used the cleaner anabolics. That being said, Oylmpic drug testing has been around since the 70's and Deca is testable beyond a year. No one uses it for their athelets because of this. Also no one really wants hypertrophy in their atheletes either. Most times they want strength without the weight gain hence the heavy androgens stimulating the CNS for added strength.
I can't say for sure but it makes me sceptical. There's guys here with better info than me though.