Can anyone identify this tank?

[Jobu88]

Interesting,  the first two photos in your link look similar with the small vertical area of the front armor, but all the rest are traditional JgPz IV without the vertical armor.   In 40+ years looking at German armor I have never seen or heard of the vehicle in question.   It has almost a JagdTiger-style superstructre, very boxy unlike the JgPz IV.