I have worked with graduates joining remotely during the pandemic, like most graduates they also lacked the skill to work in a real environment, but we can teach them, it's easy. But during the AI boom, the people who could teach the graduates were let go, leaving only a handful of senior engineers that had to "increase their productivity" while also mentoring the juniors. Guess where people cut corners to keep their job longer?

Yeah, I've had (and seen) interns and new-hires do fantastically during COVID.

You get what you pay for / put the work in for. If you're just hiring them, saying "read these docs and ship some PRs", and ignoring them, it's not too hard to predict what'll happen.

Engage at least as much as you would in person (more likely more, because you don't have passive hints about struggles), and it works out fine.