I didn't read it that way. My understanding was that schools were extremely backed up last year, and so-called "late" applicants, in most cases, were applicants who were reviewed late, but did not necessarily submit late. In fact, there were plenty of sob stories from people who were under the misguided impression that submitting later than usual would be fine under the circumstances (encouraged in many cases by SDN adcoms), and then found themselves shut out due to the unexpected deluge of applications.
There were no "early" applicants last year because receiving and verifying transcripts was a disaster at the beginning of the pandemic. AAMC delayed first transmission for two weeks due to this, but a ton of people were still delayed for weeks thereafter, and then got stuck in the verification queue for many more weeks after that.
That could have been you, me, or any of us last cycle, regardless of how early you thought you "knew" you would be complete. THOSE were most of the so-called late applicants accommodated last cycle.