As it says at https://www.mysterymag.com:
“It is said that anyone who moves it will surely die. In fact, it was moved a few yards several years ago when the road was straightened and one of the workmen died suddenly. ”
It’s also said to be on the alleged cross-country ‘St Michael and Mary’ ley line.
It’s said people make a lot of stuff up as they go along, but I can’t be sure these two come into that category. It’s nice that the stone still has a strange reputation in the 21st century.