I still have an old personal token that doesn’t have this structure. But that was a recent change in how tokens work and are issued. So it could be that the structure is now set like this and will not change in the foreseeable future, but only Figma team can answer this for sure in terms of what their intentions are with the current structure.
Note that you need to have generated these tokens and kept using them actively. If the tokens were generated and were not used in the specific 1-month window during the transition to the new system, such old tokens are not functional after the update. So there aren’t many of such tokens left.