Standing in not accepted risk factor for carotid atherosclerosis. There is no shortage of research about the dangers of sitting including obesity which is a risk factor of symptomatic carotid atherosclerosis. Varicose veins wile not very attractive are not considered a serious health problem and are treatable  I would invite the author to quantify the desks with peer reviewed research. The only link was to a 32 person self survey. Not exactly the most reliable form of research.

I would also like to note this is not a peer reviewed article ones does the man have a medical degree and is not qualified to give medical advice. Not staying in one position sitting or standing and increasing your activity level is sound advice. I find the claims that standing is dangerous are surprising and are against everything I learned or read about accepted medical recommendations.