Could it defend at all from that position ???
Oh no. That one's not all that bad, it'll take about two VTR *tow trucks* or three other tanks to pull it out IF the tracks will still spin, which it looks like it's wet enough that they will. I've seen tanks in MUCH worse than that.
Could it defend at all from that position ???
Sure. The main gun and gunners sight and rangefinder still work, the turret still rotates and the coax and AA machineguns and NODs are all functional, except for the driver's 'scope and, probably, vision blocks. The radios are intact, so they've got a dandy position for calling in supporting artillery or air cover if needed. They've just lost their mobility for a while, and if they prep it right before assistance arrives, can be out of there in 15-20 minutes.