I deal with job applications. It's incredibly obvious when a CV and cover letter is just AI. There's no need to even confirm it with software. Everyone bins them straight away.
It's not so much a surge in using AI on genuine job applications—and honestly, that wouldn't even be an issue—its the sheer amount of slop spam coming in. They'll apply for half a dozen jobs with different resumes catered for them, from anything from entry level data analyst to director of marketing, not realising it's the same company.