Edit January 19: FLI has made a substantive statement about this issue:
https://futureoflife.org/rejection_statement/
This seems concerning. It is claimed that the Future of Life Institute, run by MIT professor Max Tegmark, offered but did not pay out a grant to a Swedish far-right foundation. The character of this foundation and its associates is well-known in Sweden. Expo is an old and respected watchdog organization specialized on neo-nazism and related movements.
https://expo.se/2023/01/elon-musk-funded-nonprofit-run-mit-professor-offered-finance-swedish-pro-nazi-group
I believe Joshua was talking about the claim that Per Shapiro was a contributing writer for Nya Dagbladet.
There's no direct evidence in the Expo article as far as I could tell for the fraternal link, but there's definitely external evidence. For example, here's a tweet from Max himself, linking to Per's podcast and calling him 'my brother Per' (subject to accuracy of Google Translate).