When the kids are in bed and the house is tidy (even if you have to do it alone) sit him down, tell him his shouting and constant policing of household tidiness is wearing everyone down and making you and the children stressed. Ask him if he feels happy when he's shouting - I doubt he does.
Ask him to discuss how, working together, the two of you could make lockdown nicer and more fun for everyone. Show him some of the happy videos you hanker after. Tell him you know those families aren't perfect and their houses will be messy sometimes, too, but at least those children know their parents love them and they aren't being harangued the whole time. Ask him how he thinks those families tidy up. Do the parents make a game of it with fun prizes like bottle top medals and a comical running commentary? Could he be part of that?
Ask him to try one day being nice to his kids, playing with them, creating games to play with them and not barking orders. He can fake it for a day. Tell him you'd like him to pretend to be a nice person for one day to see if he'd like to make the switch permanent. Children are eager to love their parents and it takes years of determined nastiness to destroy their impulse to love him. Is that really what he set out to do?
If he won't countenance any of the changes, tell him, bare minimum, the shouting must stop. None of you can stand it. If it carries on, when lockdown ends he will lose all of you. Is that what he wants?
A tidy house is not a life goal. Happy, well-balanced children growing up into people who know what love is is a life goal.
Above all, be safe. If he looks like turning nasty or threatening, do call the police. They are cued up to respond as domestic abuse is much more common than people think and it thrives in a lockdown.