I do think that has a lot to do with it, she just doesn't seem to be that much of a sexual person, or maybe has intimacy issues... although, a lot of it is also that she's just being a dick tease to milk her simps for all she can, always leaving them wanting more, etc.
However, I do believe that she loves to masturbate, and when she's doing that during her Live streams, I really think she might be genuinely trying to get herself off, and might have actually done so on the odd occasion. Most girls who fake a masturbation session that ends with an orgasm do so in such an unnatural, unbelievable way. But Mati really goes for it during her Live streams, there's a sense of urgency and abandon when she's rubbing her pussy, and the weird faces she makes while she's doing it give the sense that she's way more into getting that 'O' than how she looks on cam. I've also seen pussy contractions post-orgasm, which most girls forget to do when they're faking it.
Or, she could just be really good at fake masturbating, who the fuck knows with these thots.