With sufficient reading comprehension you (and the five people upvoting your posting) would have noticed that nobody is claiming a grenade in a pot would be harmless. The claim was about removing the explosive from the grenade and detonating that inside the pot.
While I have no evidence to support that claim I have seen someone putting live ammunition in a pot and making it cook off. That experiment clearly showed that cartridges are only really dangerous when used in a firearm. I expect the physics to be very much the same here.






No, my solution would be to vacate the area post haste. I was just referring to meco03211’s posting in which he wrote
Given your theory that the type of explosive used makes all the difference, I would definitely watch a Mythbusters episode about that (if there was one). 😉