Earlier quoted context omitted.
I read that again and I'm not sure that summary helps a lot. I'll just write about what I've read turned into in my mind, where it merged with my own experience and other things I've read. Schopenhauer's main point is that death doesn't exist because time is not real. This is not very comforting unless you can imagine what it means that time is not real. I can't. He does point out that there is no rational reason to…
Of course there's a rational reason to avoid death (and hence, to consider death as something to avoid -- which, yes, is not at all the same thing as fearing it). Aren't there a whole lot of things you want to do? Well, if you die now then you won't get to do any of them. If you've achieved everything you want to in life, then perhaps you no longer have any reason to avoid death. Most people haven't. But, actually, I…
Let's leave at that: there are good arguments in Schopenhauer for not considering death as undesirable, and many of them are not necessarily dependent on his idea that time is whatever he says it is. I haven't read them carefully enough to convince anyone, let alone summarize them in a few paragraphs, but I do think it's worth pointing out this source.