Backlink on Website with No Internal Links

I've run in to a few cases like this.

Same article, written by their PR company, different photos. Two backlinks from two different sites. BUT! There are no inlinks.

1. Clearly there's no traffic to those links. Backlink may be of good authority but will it last?
2. Is this a strategy for some higher domain sites? To allow pages to sit orphaned on their website?

Thanks for any light you can shed in this area.

Cheers!
Barb

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