What you are pointing to here are non-christian eastern methods, and you are right to point out that those methods aren’t of much value to Christian Spirituality.
However what @Tis_Bearself was pointing to, was the value of the Eastern Christian methods of meditation, to Christian Spirituality (when applied properly), here take a look:
26. Human experience shows that the position and demeanor of the body also have their influence on the recollection and dispositions of the spirit. This is a fact to which some eastern and western Christian spiritual writers have directed their attention.
Their reflections, while presenting points in common with eastern non-Christian methods of meditation, avoid the exaggerations and partiality of the latter, which, however, are often recommended to people today who are not sufficiently prepared.
The spiritual authors have adopted those elements which make recollection in prayer easier, at the same time recognizing their relative value: they are useful if reformulated in accordance with the aim of Christian prayer.30 For example, the Christian fast signifies, above all, an exercise of penitence and sacrifice; but, already for the Fathers, it also had the aim of rendering man more open to the encounter with God and making a Christian more capable of self-dominion and at the same time more attentive to those in need.
In prayer it is the whole man who must enter into relation with God, and so his body should also take up the position most suited to recollection.31 Such a position can in a symbolic way express the prayer itself, depending on cultures and personal sensibilities. In some aspects, Christians are today becoming more conscious of how one’s bodily posture can aid prayer.
Continued…