No-one denies that the statement was made, but it has no significance. Just a strongly Remain MP repeating anti-Brexit propaganda. You could find plenty of Leave MPs' statements to stand against it if you wanted to.

For example, cheaper food, should it arrive, will undercut the farming industry and that would lead to job losses.

Bad example. Much of it will be products not grown here, and we intend to continue subsidising our farmers to protect them anyway.

Cheaper food will disproportionately benefit the poorest people for whom it is their main expenditure. Better to help them than wealthy land owners.