On the topic of a fix to this exploit here's what i think:
Considering both this and house jumping used the same concept of getting close enough to the wall so that you can go in, but whenever you go out it hops you 1 tile over/on the object you wish to hop over over. from there you just sprint your way in.
The solution from the beginning (from when house jumping got fixed) should have been that whenever you come out of a house or minehole you Don't go that full 1 tile distance and instead get places on the correct side of the wall (even if that ment you were inside the minehole or inside the door's sprite). If this would of been corrected via that method whenever house jumping was fixed then this problem would of been ninja fixed as well but instead all loftar did was make it so you had to have a full tile exposed to enter a house to fix ONLY the house jumping problem. Rather than make tiny fixes to every exploit that comes up loftar should go back and look at the concept of those that connect to each other and fix it as a whole, not in parts.
I do think there should be a way to be allowed to leave a minehole in any direction tho.