Thanks for reminding us… again.
I think it is important to remember as well that this document, On Some Aspects of Christian Meditation, was issued in 1989 under the direction of Cardinal Joseph Ratzinger, AKA Pope Benedict XVI, known for his doctrinal expertise and his exceptional attention to detail. His inclusion of the above paragraph, a clear caveat, or exception, to the warnings which are also in the document, certainly cannot be accidental or an oversight. The same goes for this passage, which comes just before the paragraph you quoted:
"In prayer, the whole man must enter into relationship with God, and so his body should also take up the position most suited to recollection."
Now it sounds like we are being given options here. If a meticulous man like Benedict meant to say, “And this means on your knees with rosary in hand, or at the adoration chapel,” why would he offer the more ambiguous, “and so his body should take up the position most suited to recollection.”? Having just mentioned yoga earlier in the document, and given the later passage which you quoted, it seems to me that certain postures of yoga could indeed be included in the potential positions that are conducive to genuine Christian prayer.
Not that there’s anything wrong with the rosary or the chapel - quite the opposite! - but we clearly have options - a good thing!