I think one of the keys here is that you can manufacture a certain amount of luck. Perhaps you've heard of the micromort[0] a fascinating statistical tool many countries use to determine how they spend money in healthcare. The general idea is to measure all activities in their chance to add/remove the probability of death even by very tiny amounts, this is applicable to luck.
When you go to a some event that's a networking opportunity, chances are nothing will come of it. You might go to a dozen with no good outcome but your lifetime chances of a good outcome go up once you decide to try to network, it's conceptually useful to think of these events as giving you a few points of "microluck", attending while following the author's advice even more.