The lawsuit you linked, as well as all other ‘successful’ arbitration cases against DXC, relate to OT pay or some similar derivative. OT is very well-defined by US Federal law, thus lawsuits in this realm can lean toward the employee if sufficient documentation can prove DXC violation.
Now turn the page: Severance pay is NOT mandated by law, and is TOTALLY at the discretion of the company. It is usually paid out under strict non-disclosure and publicity agreements to minimize negative press coverage. In effect, they are bribing you to go away quietly. DXC is well beyond negative press coverage. They have NOTHING to gain by paying out severance funds. So as I stated in my previous reply, they will deny, ignore, procrastinate; whatever it takes to make you go away.
Yes, you can surely sue them in court. But unless, you have precise written documentation signed by witnesses, a LOT of time, a LOT of money, and a LOT of stamina you will be banging your head against the commode. I emphasize I am not a DXC stooge… I am in your court on this. But you need to put this nightmare behind you and enjoy life. DXC is not worth a second thought, not even for the relatively minor payout you MIGHT get. Happy New Year.