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In my experience and opinion: backlink topical relevance doesn’t matter at the page level. The page the backlink comes from doesn’t have to match your subject matter to help your target page.
What i think matters is:
1. the authority of the source page linking to you – basically who links to that page and whether the page gets organic clicks in Google Search will determine this.
The more clicks the source page gets, generally the more authority and value it’ll be able pass to you.
2. The link anchor text – this is where you can add a layer of context and topical relevance with a link. I dont think its about the topic of the page itself, it’s the actual link anchor text and possibly the surrounding content (say 50 words before / after the link placement) that pushes additional topical relevance along with authority.
This is an opinion / something I have observed doing SEO over the years.
Take with a grain of salt, correlation doesn’t equal causation and run your own scientific tests to form your own conclusions.
Cheers.
