Blameless-ness occurs as the monk is not influenced by sakkaya ditthi in his act, and when the monk attains liberation. In this case, suicide is not aimed for a better next life. The act did not arise from greed, anger and delusion but intention to end the samsara as the monk is endowed with sila and samadhi, as the monk is fully prepared for panna, which he has not yet attained and as he is suffering from moha and dukkha.
But suicide is not a recommended method for liberation as there is no certainty for the monk to know their level of ripeness. Only Samatha Vipassana they should practice, as this method is also aimed for experiencing death without ending in actual death.
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