My question is.... Does he really care that much that much and can he be able to fulfill all that social and media promises he is been speculating?
Well, we can't access the depths of his inner-being to know with assurance how much he really cares about what he promises and defends, but if I could make I guess, I would say he doesn't care at all, since it's all about saying what he has to say to conquer what he desires to conquer. We live in the era of moral relativism, which is dominated by sophists. For these people truth doesn't matter, rather what matters is to convince people anything can be true, depending what is more interesting to them on the present moment.
Politicians act lead by this guideline. What is true for him today, might not be tomorrow anymore.
Moreover, of course he isn't going to fulfill these promises he is sharing on social medias right now, because it doesn't depend fully on one individual to become reality. There is a legislative house approving and disapproving laws and regulations. There is a judiciary system which exercises high influence over the other levels of power (legislative and executive). There is a media enforcing its agendas as well.
Lots of personal interests are involved on the process of ruling a country, and all these interests are infected by moral relativism, where each individual wants his necessities supplied, without caring at all about others who are around. Therefore you can be assured that a politican making such promises is very naive or is very elusive and manipulative. As we know Trump isn't naive in anyways, I guess he must belong to the second category then...