Kissing your ass comments aside… first of all - define a 10x developer.
We’ve all seen this phrase thrown around and it’s useless. Define the characteristics of one.
I’d argue the hiring of juniors is dropping because why should a firm ‘invest’ in someone that is likely to leave before they become of benefit for the firm? Mobility in the software engineer profession harms it. The fanfare around LLM’s enhances the argument via leverage provided to seniors.
E.g in accounting etc people tend to stick around for a long time in one firm… hence the expense is an investment. Firms invest in juniors to have future directors, partners etc. this is not a model that applies to software engineering. It may have done at one point, but not anymore.