How can Labour’s proposed welfare reforms work mathematically?

I've been following Labour’s recent announcement on welfare reform, specifically targeting economically inactive individuals (around 9.29 million people in the UK, including carers, disabled individuals, etc.). The idea is to encourage or push more of these individuals into employment.

However, recent statistics indicate there are only around 819,000 job vacancies available. Additionally, about 1.56 million people in the UK are currently classified as unemployed. This already substantial gap raises serious questions about the practicality of moving even more economically inactive people into the workforce.

Furthermore, considering automation and advancements in AI potentially reducing job opportunities further, how can this proposal realistically work when there could be even fewer job openings in the future?

I'd appreciate hearing any insights or alternative perspectives on this issue.