The article is a bit off base IMHO. That guy could go snowboarding, he just thinks the warning he got creates a risk that isn't worth it. It sounds to me he hasn't even thought much about risk mitigation, or alternatives, etc. So really he's talking about letting go of a non serious fantasy that he has. 'Dream' is a bit of a wishy washy term... you could call that fantasy a dream, but you could also call things you are really determined to achieve a dream also. As long as something is possible, then its potentially achievable. Sometimes you have to go down paths where things only "might" be possible before really knowing if it is actually achievable. If things are important to you, go down "might be possible" paths unless the pursuit of that is detrimental in other significant ways.
With respect, the author said his doctor told him not to. I am certain that the author and their medical professional know a hell of a lot more about what's a good idea for his body than you or I do.
When you are young and healthy, it feels like your body has no real hard limits, and doesn't define the boundary of what is and what isn't possible. But at some point, through age or misfortune, you will learn that, no, sometimes your body tells you "no" and you must listen.
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I don't think the "is he physically capable or not" question is really relevant to the point the author is trying to make.
The point is that you only have so much time, and you will never do all the things you want to do, and learning to deal with that fact is an important thing you have to do.