It's not just that vegetarian diets are "fine" - there's actually a wealth of evidence that a meat-free diet is far healthier - in terms of risk of heart disease, high blood pressure, type-2 diabetes, and various forms of cancer, for example.
I'd genuinely be very interested for those sources to be shared, please...
edit: I also have some doubts on the care taken in this study and it's peer-review. As there is an easy to spot mistake in table 2 (the dietary fat section).
https://www.frontiersin.org/articles/10.3389/fendo.2019.0034...