A statement like "veganism is unhealthy" is so objectively wrong that it really harms your credibility in general. I wonder how much you actually read from the article, or did you just grab the title and run with it?

There are a small number of specific nutrients that are readily available in meat that are harder to come by in a vegan diet. Harder but entirely possible, especially with supplements.

And many of the meat alternatives that you were disparaging earlier are specifically engineered to provide those nutrients (in particular Impossible and Beyond brands).

"Veganism is unhealthy" in the same way that any eating pattern is unhealthy if you aren't mindful of what you're eating. Conventional meat-based diets have much higher risk of heart disease due to high cholesterol, so let's go ahead and label that unhealthy too.