Yes are correct on failing to invest in technology but that may well lead to a loss of jobs, many of which will be skilled, jobs the unemployed cannot do.
Manual and Care work jobs are not quite so easy to automate.
You say there are 5m on out of work benefits? so people who are sick, chosen not to work, unemployable, older people etc and you think they will be able to become bricklayers, slaughter men, various trades people and are suitable to care for our parents?
Brexit meant that we lost access to, generally speaking, well educated people from (close by) culturally similar countries, with equivalent skills and good English for ones that are not well trained and bring in large numbers of dependents.
Its also meant that we've many more people here who otherwise would have gone to the EU either to work or retire.
Walk around my local Hospital in Plymouth and there are very high numbers of migrants working there, from Dr's to porters and everything in between, how would you replace them?
Its empty words to just say "halt migration until we fix our economy/nhs etc..."
Farage has no more idea on how to limit/stop migration than my cat does, he is selling cow pats dressed up as choc cake.