What do you mean with “legacy”? If it`s this:
They continue working as long as it’s technically feasible to support them. Hopefully we support them still years, like we’re used to, but eventually also those will deserve a retirement plan.
then you might be missinterperting this. It only talks about the Devices in the old licensing (“legacy” Devices). That does not imply that we will not see any new Xperia 10 devices also offically Supported.
The answer if newer Versions of the Xperai 10 series will be available can only be answerd by Jolla or until a new device will be added (wich is probablly still at least a Year away), we will have to wait.
And where were any of the promises broken? Jolla can`t do anything (at least realisticaly) then to wait until Sony puts out working blobs for the Xperia 10 V and 10 IV. The one time license will also be available (as stated above in the Q&A), but they will most likly only give us more infos about it when the Xperia 10 V & 10 IV have all/importent features working or they provide App Support anyways.