Answer
Yes, it is meant for devotees as well.
We also begin our meditation from the lotus feet of the Lord.
Although Śrīla Prabhupāda discusses aṣtānga-yoga, he explains everything from the perspective of bhakti-yoga. Whether one is practicing aṣtānga-yoga or bhakti-yoga, meditation on the form of the Lord is important. Every aspect of the Lord's form has its own unique significance, and by meditating upon it, one gradually develops attachment to the Lord.
At the same time, the Hare Krishna mahā-mantra is non-different from Krishna Himself. Through chanting, all these realizations gradually become manifest within the heart.
For us, purification comes through the processes of devotional service, especially hearing and chanting, which are among the nine processes of bhakti (navadhā-bhakti).
All the processes of bhakti are equally potent. It is not that only one process is effective and the others are unnecessary.
Different people are attracted to devotional life through different aspects. Some are attracted by beautiful deity worship, some by prasādam, some by books, philosophy, or association. Different features of devotional service draw different people toward Krishna consciousness.
However, for everyone, chanting is the most important sustaining principle.
As one chants and becomes purified, one gradually becomes connected with higher spiritual realities. Therefore, hearing (śravaṇam) and chanting (kīrtanam) form the foundation of further advancement in bhakti.
