I agree with that assessment, which I think is a pretty toxic view to have. Everyone is going to work to do work, get paid and go home. Two coworkers might be open to a relationship, but if someone is walking in with the assumption that work is a good way to find a partner then their presence is just going to degrade the working environment for everyone else.
(And yes we're all just human and such and such but we've got social contracts around maintaining a decorum so what you feel doesn't have to be openly expressed)
From what I've gathered people who create these kinds of relationships at work don't have much of a life outside of work. That narrative makes sense for the founder role, you'd constantly be working and obsessing about the success of your company. It also makes sense as a startup employee, you put in serious time and energy when a company begins.
If you don't have friends or social functions outside of "going to work" I guess it's inevitable that you'll date a coworker.
But I think that's an issue, if you're a founder without much relationship ties outside of work then will it influence you to hire more people you think you might develop a relationship with?
This is a really _really_ grey area since it's nice to work with people you enjoy interacting with, so that does seem like a valid hiring motive, but it's unacceptable to filter potential hires by people you'd enjoy going on a date with.
Basically, in summary, it's pretty hellishly complicated and if you can avoid workplace romance you'll probably be happier for it.
(And yes we're all just human and such and such but we've got social contracts around maintaining a decorum so what you feel doesn't have to be openly expressed)