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
Overall I think any reasonable person should have an intuition that the site is dodgy after skimming a few articles, and the Nazi articles are just irrefutable proof if you want to question that initial impression.
> To be honest, given that the last name Shapiro seems to mostly be used by people with Jewish ancestry, I'd be kind of surprised if his brother knew about that content before submitting
I'd guess Shapiro knows he has some strange bedfellows but cares more about pushing anti-vax and right-wing populist view points than avoiding Nazis (unclear if he knows about that specific editorial ofc)