Editing Old web2.0s for new website

I have several old web2.0s, 2-5 years old for my now tanked websites.

They are one page web2.0 so cant add new but can only edit the previous one.

I can add brand new article with contextual backlink by editing the previous one.

Only problem is these Web2.0s have URL/Backlinks based on unrelated keyword.

Would these aged but unrealted web2.0s benefit my new website?