OK understood. But you understand this makes them sound like the type of person who doesn't believe any of the "worldly concerns" are worth addressing because "the end is near" right?
So it all hinges on an empirical disagreement you have with them. There's nothing particularly unserious about that.
There is quite a lot of mathematical research into agentic behavior that suggests a combination of instrumental convergence and the orthogonality thesis make it very likely a superintelligent agent will have arbitrary goals that lead it to attempting a takeover of Earth's resources to achieve them.
There can't be a science of superintelligence because it doesn't exist yet, but the best theories I have read seem sound, similar to how 19th century theories of anthropogenic climate change turned out to be sound.