My understanding is that laws covering mass layoffs have resulted in a plan to keep them employed normally for 2+ months (they just aren't showing up to work and don't have access to systems), and then the severance would be a lump sum after that. So I don't think Twitter would be liable to pay out 2-3 months of salary immediately, but that severance package is still going to be a big dent in the company's funds when it comes due in a couple months.