It can actually be interpreted in two ways. I feel that passion for a particular domain is very important. May be what he meant was that their culture and mentality would be the same regardless of the product. This shows strong commitment towards building something!
On the other hand, if he genuinely meant that they will just build stuff for the heck of it, regardless of the domain they are in, then it's a bit impassive for a person in the startup world. From a businessman's perspective, it's all about whether or not you build some product. From a techie's perspective, it's all about whether or not you build the right product. So in retrospect, may be he shouldn't have said that to an interviewee during an interview.