Now lets compare T vs. F and S vs. N. Even though Fe is more objective than Fi, it is clearly a reflection of a person's internal values. Therefore thinking is more objective than feeling. (Also Magic Poriferan's definition talks about analysis which should clarify further than thinking is more objective.) Now if we compare S to N, sensors see things as they simply are while intuitives interpret what they see. I think it should be clear that Se is more objective than Ne since Se plainly sees reality as it is.
So according to Magic Poriferan's definition we are looking for a type that views reality without bias (Se) and can analyze it (Ti). Since the unbiased nature is the most important aspect, the most objective type is ESTP, but I'll add that ISTP is a close second.
As an aside a good case can also be made for ESTJ being the most objective type. In this case though their objectivity comes from their unbiased decision making process (Te). I don't believe this is what Magic Poriferan was referring to in the definition though, so I stick by ESTP as the most objective type.