Not sure how you’re reading it that way.
The post says:
“Any customer who bought a Tesla prior to this week’s price adjustment will be able to upgrade to Autopilot for $2,000 or Full Self-Driving capability for an additional $3,000. In other words, for a customer who previously hadn’t purchased Autopilot plus Full Self-Driving, they will soon be able to do so for $6,000 less than before.”
Both these sentences say it will be a total of $5k for people who never purchased either one before.
First sentence says AP for $2 or FSD for an additional $3k. Which is $5k.
Second sentence says EAP + FSD for $6k less than before. The “before” post purchase price of these two was $11k. $6k less than that is $5k.