He alludes to sanctions being a factor but never clarifies on advice from his lawyers. ngl I don't like the look of it just from a transparency perspective.
Probably because the advice in question was lengthy and technical (subtype: laws and legality), and the short form had the disclaimer "Please don't publish the short form because it's too much like giving legal advice.) Something similar happened back in 2012 with Project Byzantium, when we were consulting with the EFF with respect to having cryptographic libraries included in the distro.