Hi! That's a classic and inexpensive way to produce CO₂, and it's still being used today—even by many growers I know in my country.
That said, if cost isn't a concern, there are easier and more efficient alternatives available nowadays.
By the way, I recently completed a genetic cross project by reversing a female plant, and I'm currently testing the results. I'd be happy if you checked out my page. 🙏👽