it's a little distasteful, but i don't think it's disrespectful, and the inner character conflict ("I've been afraid of death, all along") suggest to me the author does have some understanding of the topic. i honestly think unless you've been through stuff like this yourself, you couldn't find the courage to actually write something like this. the phobia thing comes across as a tongue and cheek way of representing these feelings from the perspective of someone who has thought about them before, rather than an outsider making fun of those feelings
edit: ok so i'm looking at the author's other works and suicide seems to be a common theme. i think they might just be very interested in the topic LOL