I don't disagree with much in the article, but I disagree with the implication that parking requirements are, or ever were, designed to meet the needs of businesses and business owners. They aren't. They're driven by voters who want businesses to have more parking than business owners would pay for, given the choice.
It's an important distinction because of the way arguments over parking play out. If parking requirements are engineered to match the needs of businesses and business owners, then as the article states, they aren't "needed," but also it can be argued that there's little harm in mandating what conscientious business owners do anyway, and preventing outliers from causing problems.
The article does that in its own way by attacking the research behind parking requirements, but it fails to take the next step and point out the obvious: the research would be a lot more solid if anyone believed that it mattered. Even if it started out weak by necessity, it would have been improved and updated over the decades if anybody cared. But there's literally no connection and nobody who cares about a connection.