In presume this is because the current licence covers flights this year using the same profile as IFT5 - allowing up to two more.
Next year will, presumably, be a new licence covering Starship recovery.
This is a far bigger step than it seems. The booster launches over the Atlantic and then burns back to the launch site, having a footprint just over the ocean and launch site.
The Starship will be launched eastwards but will have to complete an orbit and re-enter, as did the Shuttle and as does Dragon, crossing over California, New Mexico and Texas to get back to the launch site - unless they build a catch site at Vandenburg (which would assume a future launch tower there as well launching to the east).
BREAKING: Elon Musk just announced that by early next year, SpaceX will attempt to catch the Starship itself, not just the Super Heavy booster.