They look really similar, but legally entirely different.
In "gardening leave" you're still an employee and on payroll until the last day. Whereas severance you're not an employee and typically paid lump-sum (but doesn't matter for this discussion). So in this specific situation, yes, that would be wages and would be paid out first before creditors because you are _legally_ entitled to those wages.
The problem of course you cannot hope to put a whole company on "gardening leave" in hopes that it can "act as severance" for everyone. Your creditors will sue you and easily win. They'd probably put an emergency injunction on the company and remaining funds before the first month was even completed once they learned of "creditors hate this one little trick!"
