Question on Expired Domain Backlinks

What do you think of pbn sites with links from mirror sites?

The content on the mirror sites is duplicated but the mirrored links are coming from a bunch of edu sites and the pbn site itself is DA 35+. The other links are quality too.

Are sites like this effective in your PBN? Anyone have first-hand knowledge?

As a PBN I think It will be useful, at least if these links didn't harm the PBN site it self, it won't harm the money site you will link to.