Thanks for the warning! The person who created that website obviously doesn't understand that he is creating a great deal of bad kamma for himself.
Four types of letting go:
1) Giving; expecting nothing back in return
2) Throwing things away
3) Contentment; wanting to be here, not wanting to be anywhere else
4) "Teflon Mind"; having a mind which doesn't accumulate things
- Ajahn Brahm