Are they definitely not mouth clicks?
The irregular clicks, most obvious between ‘truth…about’ and ‘dimension…of’, sound like mouth noise to me. This would go some way to explain why you went for a spell without them.
The declicker plugin, discussed and linked to in this thread, does a good job of removing them at default settings.
Maybe zoom’s processing/noise cancellation rendered them inaudible on the occasions you used zoom to record.
As for the earlier, different, clicks at around 1.95s and 3s-ish - is there a slight edit there? Maybe the release of a mouse click or a key press?