I never read in all of Scripture, especially the New Testament where a believer has to take some course or some sort of training to ‘enhance’ The Holy Spirit within me. I did not check out the link you posted, but there is no need for things like this within The Faith. It makes God ‘imaginary’, and therefore is a form of unbelief to practice it, helpful as it may or may not be to whatever goals you have it in your mind to achieve. The Holy Spirit can very well communicate with you without the help or use of some sort of mind practice/exercise. To deny that is to deny The Truth of God, His existence…
2 Timothy 3: 5 “… having a form of godliness but denying its power…”