These arguments miss the point that Spanish-speaking people might want to discuss startups/business/technology/etc in Spanish with other Spanish-speaking people (whether or not the original content was written in Spanish), network with other Spanish-speaking people, collaborate and co-found companies with other Spanish-speaking people, and so on.
If you're going to start a company, or discuss technology, or whatever, there are benefits (as well as drawbacks) to doing that within a community of like-minded people. If you were born and raised in the US, would you go off to start a startup with two other guys from Tokyo whose culture and mindset might be vastly different from yours? Or would you do it with your local friends? Similarly, an entrepreneur from Spain might be a lot more comfortable starting a startup with some fellow Spaniards than Americans.
On the flipside, there are benefits to expanding your horizons and you might learn a thing or two from people outside your culture and social sphere who have different perspectives.
Because of that, I think the two versions can coexist nicely, rather than one being a substitute for the other.