The author is writing with heteronormative patriarchal assumptions in his ("Steven's") language, which is unfortunate. There are people doing good work to challenge this when it is institutional.
Most of this advice applies to any relationship, though.
I wouldn't be so polite as to call it "unfortunate". It's lazy, and it's careless in the kind of way that leads to serious error.
As I pointed out, lots of entrepreneurs (including me) are in committed relationships when the urge to create a new business strikes, and face entirely different challenges. That goes beyond the heteronormative, patriarchal language failures and into a general failure to understand real people.
Maybe I am being overly diplomatic, but this author is responding to an article that includes the following paragraph:
Women are attention whores. They hear you have money, and they flock to you.
They can’t understand that the entrepreneurial life comes first. You
might have to cancel your dinner plans. You might forget an anniversary.
Drop a ho, your priorities are straight.
This article could easily withstand some combination of s/girlfriend/relationship/ and s/girlfriend/partner/ other than that its title is directly addressing the original article. The original article is fundamentally conceptually broken.
(insert political reference about a primary challenge from the left. pick your battles?)
Most of this advice applies to any relationship, though.