https://www.mlb.com/glossary/transactions/non-guaranteed-contract
According to MLB
Per the 2022-26 collective bargaining agreement, arbitration-eligible players who settle with their teams on a salary for the subsequent season without going to a hearing will be eligible to receive full season termination pay, even if they are released prior to the start of the season (this rule will go into effect after the 2022 season). Previously, the salary for such players only became guaranteed if the player was on the Major League roster or injured list when the regular season began. Arbitration players who were cut before then would be owed either 30 or 45 days' worth of termination pay, depending on the point in Spring Training the player was released.