Again it not "a suicidal last chance shot" it is only shot it would use.
Pak36 was obsolete and the Stielgranate 41 was the only way to make it viable. A crew woun't give their position by firing anything else. They would simply ambush and wait until enemy units where in range.
Of course, he can make one shot and:
- firstly it will be surrounded, tanks are usually moved by a group and will be destroyed by another tank
- Secondly, the tanks are usually accompanied by infantry, so the infantry will also try to destroy the crew, and notice the infantry's chances are very good 200 meters from the cannon.
- in the third, the loader will have to leave the shelter and load the cannon on the barrel, this will unmask the cannon and the loader most likely the dubet is immediately killed
may not be entirely correct, but here are historical footage from the PAK-36