The HN title here is currently “Performance Hints (2023)”, but this was only published externally recently (2025). (See e.g. https://x.com/JeffDean/status/2002089534188892256 announcing it.) And of course 2023 is when the document was first created, but much of the content is more recent than that. So IMO it's a bit misleading to put "(2023)" in the title.
If the numbers come from analyzing performance in 2023, that seems more important than the external publication time.
The page is about tips for writing fast code. Much of it applied 20 years ago, and will apply 20 years from now. If by "the numbers" you mean specifically just the table ("rough costs for some basic low-level operations") in the "Estimation" section (which accounts for less than 0.5% of the words on the page), then that table was initially created in 2007, and is up-to-date as of 2025. Other numbers on the page are given with their dates, like 2001 and so on. So 2023 does not seem relevant in any way.
(Ok, we've belatedly taken 2023 out of the title now)
Surprisingly I didn't put 2023, it was merged with another submission possibly with the help of mods
FYI: It's possible for that to be edited by others.