I think the far more compelling similarities lie between the massive symbol on the floor of that same room and the symbol on Eris' ship and scattered around the house of Winter's territory. The circle with the four outstretched arms. They're practically the same symbols. The symbol on the Universal remote is all over cabal buildings in PvP and PvE and there are similarities between the Mythoclast and structures in the vault. There's also the Pocket Infinity symbol plastered all over Rasputin's bunker. I think the only secret there is that Bungie loves to make everything seem interconnected. Just look at the Thorn/Bad Juju symbols and the dark below DLC. The 'mark of the devourer' is everywhere and we still don't know what that is.