"We in this country have a massive problem with the construction industry. " That is politics, not maths.
"From the top we have a bunch of wealthy White British Men (Re-mainers) running an industry they know nothing about." That is pure opinionated speculation, not maths.
"They have advisers (Re-mainers) below them earning very well who also don't know the industry from the bottom up." More opinionated speculation, not maths.
And so it goes on, pure opinionated speculation, not maths.
For someone who cannot tell the difference between opinionated speculation, politics and maths, you do know your figures, except there were none. Neither were there any maths.