No. Just no.
"A Just Russia" is a fake party founded by the Kremlin to simulate "political competition" and give people the impression their concerns are addressed while not at all being a real opposition party in reality. The Kremlin has since abandoned the idea of simulating political competition but still lets A Just Russia run because well, otherwise people (also abroad) are going to complain about a lack of "parties". It is not a real party. And it is not a "real" social democratic party either.
This thread is why people should really look beyond the section "ideology" on Wiki when forming an opinion of parties in countries they don't know much about. In many non-Western countries, ideology either plays a secondary role or no role at all. In such cases, Wiki's cute labels ("social democratic") become utterly meaningless, particularly when the country isn't an actual democracy.
lmao a guy from the Netherlands is trying to explain Russian politics to a Russian