[nerkvcbtre]

I have not heard these things claimed in this way

You are unlikely to hear such things as it's considered a very serious offense,the results are that one is no longer considered a monk.

The Buddhist Monastic Code I
Chapter 4

Pārājika (the most serious type of offense)

(4) falsely claiming to have attained supernatural powers.

A monk who commits a pārājika offense is compared to 'a person whose head is cut off, or a withered leaf dropped from the tree, or a stone slab split in two, or a Palm tree cut from the top'. Such a one has been 'defeated' (the traditional etymology of pārājika) and cannot be readmitted to the Order.