I'm genuinely curious if this is a thing with roots in Spanish culture? Because there is strong Spanish influence in Philippines and South America.
I don't know any Spaniards but I do know Filipinos and the confidence projection is a real thing. The Filipino IT guy confidently declared that my OnePlus Android phone wasn't certified for the software he was trying to install and was getting errors. It is a bog standard application that can be installed on any modern Android phone but the level of confidence he projected, just because he didn't know OnePlus as a brand, made me doubt myself until I turned on the critical hat and pushed back a little with alternative approaches, which solved the problem.
Over the last couple of years, I've spent a lot of time in Indonesia. By the time I got used to their way of communicating, I questioned my own reality, perception and sanity. I even put a thought it's some very passive way of gaslighting foreigners. It seems it's just how they like to do it here.
I'm a patient person, but it can be frustrating to have to endure 10 minutes of verbal diarrhea that eventually results in a "no" or "I don't know".