Is this LEGO set complete since it has 0 pieces?

Yes, the set is listed with 0 pieces, indicating it is a collector's album rather than a standard buildable set.

What theme does this LEGO Movie 2 album belong to?

This specific collector album falls under the Gear theme.

The set was released in the year 2019.

Name: LEGO The LEGO Movie 2 (Coins) Collector Album (5702016590623-1)
Brand: LEGO

Gear

Gear · 2019

Theme · GearPieces · 0Set Number · 5702016590623-1Year · 2019

Used

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New / Sealed

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Is this LEGO set complete since it has 0 pieces?: Yes, the set is listed with 0 pieces, indicating it is a collector's album rather than a standard buildable set.
What theme does this LEGO Movie 2 album belong to?: This specific collector album falls under the Gear theme.
When was the LEGO Movie 2 Coins Collector Album released?: The set was released in the year 2019.