If you buy this philosophy then the importance of time vanishes and there is no need to pretend that you have all the time in the universe. Choosing to waste time is not objectively worse (though it may be boring) and on these grounds I agree with the author.
However by the author's same reasoning it is not important to be happy either. After you have died it will not matter how you felt while you were alive. So to me the conclusion is silly.
But I nevertheless enjoyed the article. I do ponder my own life from time to time and I like reading about how other people deal with the finiteness, or rather infinitesimal-ness- of it all -- just the idea terrifies me. (So does the idea of living forever -- a pretty unfortunate Catch-22.)