I will confess, I did not know Smalltalk even existed and when I read this headline I thought it might be referencing the ability to make... well, small talk with people. And to that I did think "that might make sense to me". Because it seems like being able to communicate your ideas, entertain and keep people engaged might be very useful tools to have as an entrepreneur, after all, people need to buy into your idea to begin with.
I really think a lot of these advice pieces are just... garbage really? I mean there's good resources out there for start ups but everything that pretends to be a secret weapon, a canned solution to success is always going to be nothing but fishy clickbait. If you want to get serious about it then of course, the tech stack might matter and of course this website being tech oriented we are going to be a bit bias towards it... but the secret sauce is probably everything but the tech stack you choose for your app. In reality, if you want to be an entrepreneur in tech you probably already are capable of doing an MVP in python or javascript. And if you're not, then it might be smarter to partner up with someone that knows.