Don't be a smartass, read the study.

They measure risk of death as 'your risk of dying in the next 12 months'

And if you really want to be a smartass, note that about 5% of all people have never died.

By my troth, I care not; a man can die but once; we owe God a death and let it go which way it will, he that dies this year is quit for the next.

If you think brain uploading and/or gerontology will possibly produce a cure for death, your odds of dying may be somewhat less than 100% over some arbitrary finite but very long time span.

Even if you disagree with that, you can still parse the statement the way it was intended.

yup, and skydiving without a parachute doesn't change your risk of death either since it is 100% anyway!

"higher risk of death" means on average people who engage in the behavior die faster.

they didn't say a higher risk of "eventual death". At every moment in your life, you have a certain risk of death. When you reach 114 years of age, the risk is pretty high from moment to moment. Right now, fingers crossed, your risk is pretty low.

Too much sitting increases the average of the risks of death for some of the remaining moments of your life. Ha! Pedant your way out of that one!