We aren't having early access. I guees one could see it that way. From lore early access isn't a thing. In the destiny universe it exist therefore it is cannon. Also no siva can't be anywhere it wants to be. If so it wouldn't have been trapped in the replication chamber all those years. From lore we eradicated siva itself by destoying tgat replication chamber. We then set out to destroy the splicers who were the only ones keft with siva. Yea siva did develop a mind of its own. Still it can only follow the protocol within its own coding. It would have had no reason to go to venus. So essentially when we eradicated the devil splicers we wiped all but a single engire core of siva from existence. The core is how we ended up with outbreak prime. It isn't impossible that siva somehow somewhere coukd still exist but there is nothing in the lore to even support that theory. Only that it has been wiped out.