FSD 12.3 is the current version of Tesla's self driving software. The article is comparing that current version of FSD to Waymo's 2020 state and saying that Tesla's self driving code today is worse than Waymo's 4 year ago. That is, according to the quote, Tesla is more than 4 years behind.
It seems silly to analyze a 4 year old version of something that is changing extremely rapidly.
Both Waymo and FSD have come a very long way since 2020.