They do both, but often not with direct awareness on the part of the recipient of the information as to where it originates and truly from whom. They use a combination of psychic messages given directly to the deep subconscious along with manipulation and control of human beings who are commandeered for a time to attend a face-to-face meeting and give marching orders, in effect, as their own persona, but it will not be them who is controlling the body at that point in time. Their awareness will be, in effect, switched off and then a memory suppressed of the entire episode and usually those involved in such communications will be none the wiser that anything is amiss.
There can also be Reptilian shapeshifters who imitate someone in authority and will present themselves at an arranged meeting as an imposter and this will never come to light. Many times the person in an official role has only a tangential interaction and with no prior history or even awareness what the individual looks like, it is easy to send in an imposter with a specific agenda in mind and get things in motion through an orchestration, and those who are supposed to be in charge may never even know something is being done under their watch that they may have had no part in directly but is being done by underlings influenced through outside means of this kind. So there are many scenarios here that can be utilized to bring things about to favor the aims of the Extraterrestrial Alliance and cause problems for humans and their institutions.