If it is true that he just doesn't realise and likes his cushy life, ie he isn't the type to manipulate to take advantage, then it should be fairly easily fixed.
General "help" with housework is not going to work. He needs jobs that are "his". I bet he has a few already, bins? Lawn? Add more.
Pick a couple of the biggest most hated jobs and hand them over to him in their entirety. Don't ask, tell him these are his jobs now as you are tired of doing it. Then detach. These are now his jobs. Don't remind him, check up, criticise, advise. No giving top tips or "helping".
Think of it like him showering: it is important to you that he does it, you wouldn't remind him to do it, nag, check he did it right, comment if he did it a different way to you, wander over with a flannel to wash his bum for him if you were annoyed he had left it unwashed too long, etc
Laundry is a brilliant one to hand over. It takes fecking ages, is relentless, is theoretically easy, and failure to do it is obvious to everyone.
Preparing bags and clothes for the next day too. This shows up failure to do laundry, e.g. No clean socks for DD. Also shows how much thought goes into it all and requires engagement with planning DC activities.
Meal planning and online groceries is another brilliant one.
Also if DC are 8 and 10 you should not be doing the dishwasher, table wiping or hoovering. Those are the most perfect jobs for that age. Make pocket money, screen time etc depend on it.