Please stop posting new topics. Your questions can best be answered in the threads you already started.
https://ttlc.intuit.com/community/taxes/discussion/re-sign-on-bonus-repayment-clawback-federal-state...
https://ttlc.intuit.com/community/taxes/discussion/re-sign-on-bonus-repayment-tax-adjustment-w2c-or-...
Wait until you actually get a corrected W-2C for 2020 (if they issue one. You are assuming you will receive one. It could be the person you are talking to is not knowledgable and when the company makes the request to their payroll processor, the payroll processor will straighten them out.)
Also wait until you see if the company actually pays the social security and medicare refund they promised.
When you have all the paperwork and all the checks, take your situation to an enrolled agent. This is an accountant who is specially qualified to practice before the IRS, not just a storefront tax preparer.
