Well,
I didn't read the entire study, but the link you provided is from Daily Breeze (not mainstream) which links to a PDF of a study which is published on bioRXiv.
bioRXiv is an open repository for papers. The papers are not peer-reviewed. So, basically, anyone can write anything and publish it there.
That does not mean there is no merit to the study. It means there is no way for me to know if the study has merit because I am not a peer (not an expert in virology or pandemics) and so I am not qualified to review the study or its conclusions.
As a general rule, I would avoid putting too much faith in a non-peer-reviewed study.
There is so much work being done right now, and knowledge is growing so rapidly, that it is hard to not get lost in the "changes" being published by scientists around the world. If you add in the non-peer-reviewed studies it is virtually impossible to know what to believe.
I hope the article is accurate, gets reviewed, and is found to be trustworthy, but for now, I can't recommend it.
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