How to get a job at a startup if you're not technical

Some of the advice here seems rather optimistic for 'not technical':

- Have a (technical) side project

- Do basic HTML/CSS coding as needed

This may well work for someone who starts out as (say) an engineering major who wants to transition to a programming role in a startup, but I know some Project Management people who would have a very difficult time doing the above, but nevertheless add lots of value.

Unfortunately, I know very little about how PMs are hired / show skills. Certifications? Discussions about what they've done for past companies? Seems like it would be very difficult to weed out bullshitters on a phone screen. What's the equivalent of 'fizzbuzz' for a PM?