Her company hasn't been bailed out by David Beckham multiple times.
They're married. They used family money to bail it out.
In fact, in claiming the furlough grant for her fashion business they are relying on the division between their own money and the funds in their limited companies: this is called the veil of incorporation. The company or companies exist wholly independently of their individual shareholders.
He is a shareholder in the topco of a group of companies. I don’t know much about the group structure but I bet the topco is incorporated in a low tax territory.
She will be a shareholder in some or all of the group companies. The companies that actually make money, presumably his image rights licensing businesses, can bail out loss making companies in the group via inter company loans.
Interco loans can be written off, and I suspect these will be since there is no prospect of the fashion business generating enough cash and profit to repay them.
I think you are conflating the position with some sort of ‘all marital assets are joint’ argument. This is completely different.