Not very clear, but it leaves room for ICE upgrade also "in coming months" maybe they think on the winter months? difficult to give precise answer:
"During last winter in Maranello they made an interesting decision : they kept in their pocket the possibility to update the specification of the power unit.
The move gave the Italian team not only a few important months of development but also the possibility (not the certainty given that the decision was taken during the current season following the steps forward at the benches) to test them on the track and verify the improvements on the end of the season, which has been a mirage in F1 for years. This meant, however, making the decision to introduce a fourth drive unit and therefore to go into penalty.
This will provide further information that should not be underestimated, for the benefit of the work of the engineers in the coming months who will have the opportunity to further update all six macro-components of the drive unit (endothermic, turbocharger, MGU-H, MGU-K, battery and control unit)."