Not that you know what any of the study means - but it's not a big enough sample size to make any meaningful conclusions - 81 people and they found it in 2 people? Plus from one that was viral in nature so it's likely just a mechanism of Corona.

And don't forget that none of this means that going unvaccinated is a smarter or safer option. Not even the legendary natural immunity (which is not found to be better than hybrid immunity lookitup) means shit if you have to get crippled by a preventable disease before your cells can recognize covid as a threat. Also if doesn't give you immunity to all the variants other natural immunity seekers are creating by letting covid breed in their lungs and undoubtedly spewing it out by refusing to mask up when you're actually sick.