I think the fact that she said it 5 year ago is irrelevant. Since then, has she expressed a different opinion or said that she was mistaken in her comment? Has she suddenly decided that the reason productivity is relatively low compared to many other European countries is because of under investment, poor management/worker relationships, with workers generally have no stake or say in what happens in their places of work, etc. etc?
It's interesting that, as others have pointed out, she was a great champion of leaving the EU and yet it appears she has no faith in or respect for British workers en masse. I can only assume then that her enthusiasm for breaking away from the EU was to rid the UK of "red tape", i.e. proper health and safety conditions, protection of workers' rights, etc. etc. and escalate policies already adopted that squeeze working people until the pips squeak.
And Priti Patel is one of the many people whose previous jobs are what I would describe as non-productive non-jobs that do little to enhance society such as lobbyists, marketing and PR executives, etc. etc. Her Wikipaedia entry includes this information:
" She worked for the public relations consultancy firm Weber Shandwick for several years, as part of which she lobbied for the tobacco and alcohol industries" and goes on to say:
"Patel has been criticised by political opponents for defending the tobacco and alcohol industries".
Hardly a glowing example of someone who has made a great contribution to society.