Accountants don't need to show they are qualified in interview because they have the letters ACA, ACCA, CEMA or whatever that they can clearly point to.
Lawyers and Surveyors similarly have profession bodies that handle qualification.
Software engineering is not uniquely broken but it is broken, but the author jumps to the wrong conclusion.
The other engineering and professional disciplines have professional bodies who have official qualifications.
Software engineering has never solidified around any particular set of qualifications and many think they are not relevant.
And artists are often asked to do some initial work for free before a client commits, they often end up doing a lot of "wasted" work for free without getting properly compensated, so it seems odd to argue that's a model that software should look toward.