Sorry, I don't follow this.
It's a pointless line of argument to follow, no one is going to find a feeding tube sufficient cause for euthanasia.
But for explanation, I'll elaborate. A person in that state may, if fed normally, choke. The risk is higher than in a completely healthy person. However, this does not mean that every time she is fed, she will choke; it just means that the probability is too high for the feeders to accept the liability that might result if she does choke.