In the section of the rulebook that explains the Movement Phase:
Models in the Way
A model cannot move within 1" of an enemy model unless they are charging into close combat in the Assault phase,
I don't have the
GK codex, but hopefully someone can confirm if I'm right that a teleport in this case doesn't use the rules for Deep Strike, but is instead a Jump Pack move with modified distance? If that's the case then no, he can't teleport directly into combat (sneaking past getting overwatched as well). The only times you can move to within 1" of enemy models is:
A) When charging,
B) Pile-In moves,
C) Special rules that explicitly state you can / must (Ork Shokk Attack Gun misfire, Zadsnark Da' Rippa, perhaps a few others).