Its still an invasion by definition. What the intentions of the assaulting army are don't matter in regard to whether a military undertaking is an invasion or not.

We can't just pick and choose good sounding names and assume that changes reality, or that by adhering to a definition that that somehow cedes ground.

Invasion: A military offensive in which large numbers of combatants of one geopolitical entity enter territory owned by another such entity, generally with the objective of either: conquering; liberating or re-establishing control or authority over a territory, forcing the partition of a country; altering the established government or gaining concessions from said government; or a combination thereof.