I've seen the opposite -- more senior hiring because seniors can now outsource a portion of rote work to the LLM -- everything from trivial utilities to docs to testing.
Also, I get dozens of calls/emails a month from my undergrad/grad alma matter. The bottom seems to have fallen out of the labor force when even ivy leave and top-5 cs/tech schools have students desperately seeking entry level jobs.
To be fair, as I mentioned on another comment, there are other factors:
1. Record numbers of CS undergrads (more supply)
2. More remote-CS/tech grad programs (yet more supply, many overseas)
They made it work well. They had highly decentralised teams and used a bunch of no-code and serverless tools. They also knew that juniors and interns would work longer hours and give less push-back when gives somewhat crazy requests.
I'm not saying everyone should do this. Just wanted to give another perspective.
Nevertheless I see it happening as well. Juniors left to roam freely in new projects where a senior drafted a happy path then was sent to the next project. Say hello to the way of outsourcing.