Definitely a good point that suggesting what someone can and can't do is not necessarily a positive thing to do. However, using the term startup as a broad generalization for all entrepreneurial endeavors can mean different things to different people. There are certainly startups that can be juggled around with other projects and life priorities. However, I'm sure there are countless very successful startups that would not have succeeded had someone like the author juggled all these other priorities at the same time. Not all startups can be successful, and some require countless hours of busy work, coding, and other tasks that would be a detriment to a family lifestyle.
EDIT: I don't have enough life experience to know how efficient a person can be when they have a family and manage crazy work hours, but my opinion is that Calacanis wrote about what he thinks is optimal not REQUIRED.
Dave McClure put it well in this video of why not to do a startup: http://vimeo.com/15799330
EDIT: I don't have enough life experience to know how efficient a person can be when they have a family and manage crazy work hours, but my opinion is that Calacanis wrote about what he thinks is optimal not REQUIRED.