It's actually probably because people are thinking AI is going to be more useful than junior hires. The thing "bouying up the economy" is at least in part the thing causing the effects the AI is "masking".

So I don't see any reason for correlation here, but it not like either index nor their relationship are any indication if the AI bet will actually pay off

If economic growth would be all that counts, countries like China, Saudi-Arabia and even Belarus would be better places to life in:

https://en.wikipedia.org/wiki/List_of_countries_by_real_GDP_...