I think the author is trying highlight that one doesn't necessarily fancy tools. The productivity space has so many options that it's easy for one to get overwhelmed with settling on the "best" option.

My partner relies on a Leuchtturm weekly planner; my father bought into the whole Stephen Covey system; a coworker has a stack of Post-its, and I use a hodgepodge of Google Calendar (far off single events), Apple Notes (weekly tasks for work) + Reminders (medium-term todos).

The whole point is not to rely on one's (aging) memory to keep track of stuff. As long as tasks aren't falling between the cracks, keep doing what you're doing.