Below is half learned knowledge from internet. If you start Googling "Rahu 12th house ..." then one auto-complete will suggest "Moksha"!
Rahu is considered the master of material desires. When travels to 12th house (hence Ketu in 6th house), it would find itself lack of those resources.
Such position usually creates situations where person is forced to have disinterest (vairAgya) from the material desires. Such mindset is considered an ideal candidate for Moksha as it pacifies the Rajas (passion) mode (BG 6.27).
- How is the 12th house of Rahu calculated?
- Does it have any relation to liberation?
Related: Ketu in 12th House