There are many ways how recluses of other sects might dwell isolated, how ever, the Buddha did not want his disciples to do such, and such rules not to cook, not to store food, not to pick up fruits from trees, not to damage plant live, not to live in improper dependency of some... do not allow such a kind of dwelling: isolated.
The poem does btw. not indicate such, since the teller used obiviously an alms bowl. Une finds very similar poems in the Theragatha. Being better, currently doing, such a dweller, as well as suggestions in the records: one should not stay much more fare then 2 or 3 km from settlements, longer distances for alms round are neither conductive for the practice nor for health.
There are people, recluses, even Monks ordained proper, who live isolated, have either relation to certain lay supporter, or store food, cook for themselves, even walk for gathering fruits, roots, mushrooms... but all that (mostly even accept money and use it, to manage their needs) is neither Buddhas wish nor in accordiance with the Dhamma-Vinaya, often connected with heavy offences.
From the view of personal benefit, one is reminded that one depends on others, every day and one is independent at the same time, not engaging in any kind of trade or unskilfull actions.
Furthermore, if monks would live isolated "independend" people would not come in touch, never be reminded on the fourth heavenly messenger, hardly ever hear teachings. Furthermore the tradition would be very fast extinguished. Not to speak that the world would be void to the great field of merits.
So if one seeks for the Dhamma and way of the Buddha, really no need to seach for remote recluses.
From experience, recluse on montains, living other the rightly, certain "independend, are for the most brahmanic colored, often seek to develop iddhis (special) powers, or simply make themselves more interesting for certain gains, and yes, there are also the angry ones, those who bear aversion torward other people an sociaty in an unhealthy way. For all this cases, at least one, not secure, is always very in need of correcting admirable friends, the Buddha did not encouraged to dwell in forests and isolated.
[Note: This is a gift of Dhamma and not meant for commercial purpose or other low wordily gains by means of trade and exchange.]